You must have bought the QLDB to use this add on kit.
The Quick-Lock Dumbbell 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 dumbbell sizes of 70-120lbs. The standard Quick-Lock dumbbell rack will hold the full 120 lb dumbells. The dumbbells are 19" long overall at the full 120 lbs.
165 lb Add on Kit - Custom -
This is a custom built add on weight kit for the Quick-Lock Dumbbells to bring them up to 165 lbs (for the 120-165 lb range). It is only available as a special request and they are built to order.
This Add on Kit adds 45 lbs to each dumbbell. You must have the 75 lb dumbbells and the 120 lb Add on Kit first. Then this 165 lb Add on Kit is used on top of the 120 lbs dumbbells.
The extra long locking screws are fully threaded wich require them to be screwed in and out all the way to make a weight change. This is to add extra strength and safety in the upper weight range. Please expect a little extra time required to make a weight change. It should be noted that the Quick-Lock Dumbbell handles were originally designed for use up to 120lbs. The use of this custom add on kit will void the lifetime warranty of the original product if they are dropped or abused. Custom products are not returnable. We have built many of these custom add on kits and they work really well and lock up nice and tight. Fully loaded dumbbell is 23.5" long.