The RODAC 3/8″ impact driver kit consists of 8 steel pièces. Sizes available are 1/4 “F x 3/8 “M, 3/8 “F x 1/4 “M, 3/8 “F x 1/2 “M, 1/2 “F x 3/8 “M, 1/2 “F x 3/4 “M, 3/4 “F x 1/2 “M, 3/4 “F x 1 “M and 1 “F x 3/4 “M.