Click here for more details: br br Ironmaster Quick Lock Dumbell 120 lb Add on Kbr br The Quick-Lock Dumbell Add on Kit adds 45 lbs to each dumbell to bring them up to 120 lbs each. Our new style kit makes adding extra weight even quicker and includes 4ea. longer locking screws and 4ea. 22.5 lb weight plates. You can put the "big" plates on the handles first or add them on top of the original plates.