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Plastic Bottom for Adjustable Kettlebell

5.0
Rated 5.0 out of 5 stars
15 Reviews
$41.99 USD

Broaden the weight range of your adjustable kettlebell to 9-11.5kg!

See Why 65,000+ Lifters Choose Bells of Steel

Product Features

  • UNLOCK 6 MORE WEIGHTS

    Joined to your empty Adjustable Kettlebell’s upper steel shell, it weighs only 9kg. Access the 9.5-11.5kg (20-25lb) range with your kettlebell plates for single-arm exercises like hammer, preacher & concentration curls. C’mon, we KNOW this is why you’re here.

  • REINFORCED PLASTIC SHELL

    Made from 70% plastic and reinforced with 30% glass fibers, this half shell is stronger than a typical 3D-printed plastic knockoff. That said, it’s NOT warrantied for drops, so save the fancy kettlebell flips & juggling for your steel shell — capiche?

  • GUARANTEED FIT

    It’s guaranteed to fit the 12-20.5/32kg size of the Wildman & B.o.S. Adjustable Kettlebells with no extra hardware needed. Just swap the bottom part of the shell, add some plates (optional), and get back to swinging around like Tarzan.

Product Details

Broaden the weight range of your adjustable kettlebell to 9-11.5kg!
This plastic bottom shell weighs just 0.7kg (1.5lb), making your empty Adjustable Kettlebell as light as 9kg (19.6lb). That's 3kg less than an empty full-steel version!
Access the 9.5-11.5kg (20-25lb) increments using your kettlebell plates. The lighter range is great for single-arm exercises or beginners who don't want to shell out the money for a lighter kettlebell.
Weight increments:
- 9kg (empty)
- 9.5kg
- 10kg
- 10.5kg
- 11kg
- 11.5kg
IMPORTANT: Warranty is void if dropped. Guaranteed to fit 12-20.5/32kg Wildman & B.o.S. Adjustable Kettlebells only.

PRODUCT SPECS

5.0
Rated 5.0 out of 5 stars
Based on 15 reviews
Total 5 star reviews: 15 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
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15 reviews
  • JH
    Jerry H.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    POW of the Tariff Wars 2025!

    Finally got my adjustable kettle bell out of customs Hades so I can try out the light weight bottom for a 9kg competition kettlebell. I have one shoulder that was replaced with a reverse joint unit and the other was rebuilt with cords and cadaver tendon and anchors. I’m one year out of post op and like the bigger size of this KB and lighter weight that that polymer bottom give it. And gives me that extra light range from 9-12kg that my shoulders need on some days.

    KB feels very balanced and comfortable with the polymer bottom. Fit is pristine!

    Was this helpful?
    Bells of Steel USA
    20 seconds ago

    Thanks for the fantastic 5-star review, Jerry! We're absolutely thrilled to hear that your adjustable kettlebell finally made it through customs and that the Plastic Bottom is delivering exactly what you need for your shoulder recovery.

    It's awesome to hear that you're finding the 9kg competition kettlebell size perfect for where you're at one year post-op, and that the polymer bottom is giving you that ideal light weight range of 9-12kg for those days when your shoulders need that extra consideration.

    Wishing you all the best with your continued recovery and training!

    Yours in strength,
    The B.o.S. Crew.

  • EC
    Eric C.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    1 week ago
    Solid!

    This plastic bottom is more solid than an aftermarket 3D plastic bottom I had bought before for another kettlebell. It is heavier than the other one by about 1 kg, which probably explains why it's more solid. Nothing wrong with the other one, but this one is just stouter, slightly heavier, and a little cheaper.

    Was this helpful?
    Bells of Steel USA
    17 minutes ago

    Thanks for the fantastic 5-star review, Eric! We're absolutely thrilled to hear that the Plastic Bottom for Adjustable Kettlebell is delivering that solid, sturdy performance you're looking for.

    It's awesome to hear that you can feel the difference in quality compared to aftermarket options—that extra weight and stout construction is exactly what we aim for when designing our kettlebell components. We really appreciate you taking the time to compare it to your previous experience, and it's great to know you're getting better value with ours.

    Yours in strength,
    The B.o.S. Crew.

  • BD
    Brian D.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    Plastic Bottom for Adjustable Kettlebell

    The fit on my adjustable kettlebell is spot on. I like that it allows me to make smaller adjustments in weight with the kettlebell.

    Was this helpful?
  • DM
    Daniel M.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    3 months ago
    Great product

    Plastic bottom for adjustable kettlebell is a high quality product. Purchased this product in order to increase amount of kettlebell techniques in my arsenal. Some of the moves that require a lighter bell are as follows: Deck Squat, Pullover situp press, bottoms up press.

    High quality of the shell is greater than expected. It fit perfectly onto my bell and seems to be very durable. Another great product from Bells of Steel.

    Was this helpful?
  • DK
    David K.
    Verified Buyer
    I recommend this product
    Rated 5 out of 5 stars
    6 months ago
    Perfect fit

    Great to have even more options with the adjustable kettlebell. Sturdy and well made. Recommended.

    Was this helpful?
    Bells of Steel USA
    6 months ago

    Thanks a ton for the fantastic feedback, David K! We're stoked to hear the Plastic Bottom is giving your adjustable kettlebell that extra versatility you're looking for. It's awesome when simple additions can make such a difference, right? And we totally agree - keeping things sturdy and well-made is exactly what we're all about!

    Yours in strength,
    The B.o.S. Crew

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WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov
The Plastic Bottom for Adjustable Kettlebell by Bells of Steel is a black, round bowl with a matte finish featuring an embossed logo of a muscular figure and "BELLS OF STEEL EST. 2010." It's designed for single-arm exercises and stands out simply against a plain white background.
Bells of Steel

Plastic Bottom for Adjustable Kettlebell

$41.99 USD
Broaden the weight range of your adjustable kettlebell to 9-11.5kg!
This plastic bottom shell weighs just 0.7kg (1.5lb), making your empty Adjustable Kettlebell as light as 9kg (19.6lb). That's 3kg less than an empty full-steel version!
Access the 9.5-11.5kg (20-25lb) increments using your kettlebell plates. The lighter range is great for single-arm exercises or beginners who don't want to shell out the money for a lighter kettlebell.
Weight increments:
- 9kg (empty)
- 9.5kg
- 10kg
- 10.5kg
- 11kg
- 11.5kg
IMPORTANT: Warranty is void if dropped. Guaranteed to fit 12-20.5/32kg Wildman & B.o.S. Adjustable Kettlebells only.
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  • TRUSTED SINCE 2010

  • EXCELLENT WARRANTY