The KT Pro 7-pc Hollow Nut SAE Spinner Set, No. 9-30107SR, holds a size range from 3/16" to 1/2." The 3” hollow shaft allows for maximum bolt clearance. The nut spinners are made from industrial grade chrome vanadium alloy steel, backed by a lifetime warranty, feature ergonomic handles designed to relieve hand stress and have SAE identification. The set comes in a vacuum formed tray, but also give the user an option to hang on a pegboard