Uniquely designed shock shims are placed directly onto the shock shaft to simplify fine tuning of the chassis without disassembling the shock or even removing the shock from the chassis. 14mm standard kit includes U-shaped shims 1/16" (12 pieces), 1/8" (12 pieces) and 3/8" (6 pieces); semi-solid shims 1/16" (12 pieces) and 1/8" (12 pieces); 2-piece collar shims 1/2" (2 pieces), 3/4" (2 pieces), 1" (2 pieces) and plastic storage case.