Hot Cams HCSHIM04 7.48mm O.D. x 1.50-1.75mm Shim Kit Refill Pack 7.48mm outer diameter shim kit refill pack: 1.50-1.75mm in .05mm increments with 5 shims in each size Made from 4140 cold rolled steel, Hot Cams shims make the perfect addition to any toolbox for keeping any valvetrain in perfect working order 7.48mm shim kits fit all Japanese 250Fs Convenient refill packs for when you start running low Saves the time and hassle of going to the dealership