The 17-pc Master 1/2" Drive RPT Impact Hex Set, No. MIHC17S, from GripEdge Tools, includes sizes 10mm-19mm and 3/8"-3/4", and each bit is made from CrMo steel for increased strength and durability. Every bit includes an oversized, laser-etched marking, and the entire set comes organized in a removable foam insert inside of a plastic case. The bits use a bidirectional design that prevents the rounding of fasteners and provides more torque on both new and damaged fasteners.