CFF 20 Pack Pro Style Dumbbell Rubber End Cap Our black end plates have a recessed area for poundage decals Each plate weighs 1.25 lbs so a pair of these will add 2.5 lbs to the actual weight of your dumbbell. The overall diameter is 4-5/8" (4.625") and .325" Thick. The center bolt hole is .717" I.D. Endcaps are priced as a pack of 20(10 Pair)