Quick-Lock Dumbbell Locking Screw - Add

Add on Length Locking Screw Dumbbell use: This longer locking screw is the same part used with the 120 Add on Kit. If you have the 75 lb set and want to just make one heavier dumbbell you can use two of these Add on Screws and load on more plates from the other dumbbell. Kettlebell use: You can use this locking screw with the 5 lb and 2.5 lb plates from the standard Quick-Lock Dumbbell system to get up to the 80 lbs max size Kettlebell. The larger 22.5 lb weight plate is not required.

What is a Adjustable Dumbbell?

What adjustable dumbbells are

Adjustable dumbbells replace a whole rack of fixed dumbbells with one pair whose weight you change via a dial, pin, or selector plate. They are the space-and-money saver for home gyms: a single set can span roughly 5–50+ lb per hand. The trade-offs are bulkier handles, a fixed max weight, and a mechanism that can wear or rattle.

What to look for

Fast adjustment (dial or lever beats stacking plates), a wide and useful weight range, a balanced feel that doesn’t clunk mid-rep, and a durable locking mechanism. Many sets include or offer a stand — worth it, since the blocks are awkward to load off the floor.