This is a 20 gram slotted weight for brass weight hanger WH50B or WH63 or any weight hanger with stem diameter of 6 mm or less and hook diameter of 3 mm or less.
The slot width is 3.2 mm and the center hole diameter is 6.2 mm.
Made of brass.
It cannot be used with oversize weight hangers such as WH50, 3412 and 3411 models because those models have wider stems and hooks.
If used with aluminum weight hangers (not recommended) you will have to add it from the top of the hook, not from the side.
For matching Weight Hangers, select (product code: WH50B)