I got these off Amazon one year ago: NewMe Fitness Adjustable Kettlebell Handle for Strength Training Kettlebells for Weight Plates - Home or Gym Workout- Ergonomic Design for a Comfortable, Non-Slip Grip https://www.amazon.com/dp/B07NDLBHMS/ref=cm_sw_r_cp_api_glt_fabc_3GRHW9MMY39171M5AKZ2?_encoding=UTF8&psc=1

They work great and have a max weight purportedly in the 600s. It can just hold 8 10lb plates with enough threads left to secure the locking nut.

I got this and it's large enough to fit 4x 25lbs 1" places or 2x25lbs and 3x 10lbs plates.