... :Carbon steel or CR-V; 27 PC Mechanics Tool Set:• 1/4 in Drive ratchet handle,carbon steel,heat treatment,chrome- ... steel,heat treatment,chrome-plated,• 8 pc Hex key wrench SAE - 1/16, 5/64, 3/32, 1/8, 5/32, 3/16 ... , 7/32, 1/4,• 8 pc Hex key wrench ... Metric - 1.5, 2, 2.5, 3, 4, 5, 5 ...