The Quick-Lock Dumbell Add on Kit adds 45 lbs to each dumbell to bring them up to 120 lbs each. Includes four longer locking screws and four 22.5 lb weight plates.

You can put the "big" plates on the handles first or add them on top of the original plates. Very simple to use. The longer locking screws allow dumbell sizes of 70-120lbs. The standard Quick-Lock dumbell rack will hold the full 120 lb dumbells. The dumbbells are 19" long overall at the full 120 lbs.