The OEMTOOLS Hex Bit Socket 32-pc Set, No. 22989, includes both metric and SAE bit sockets. The hard-wearing bits are made of heat-treated alloy steel while the reinforced chrome vanadium steel sockets are designed to give extra turning power. SAE sizes include (1/4” drive) 1/8", 5/32", 3/16", 7/32", 1/4", ( 3/8" drive) 9/32", 5/16", 3/8", 7/16", (1/2" drive) 9/16", 5/8", 11/16", and 3/4". Metric sizes include (1/4” drive) 2mm, 2.5mm, 3mm, 4mm, 5mm, 5.5mm, and 6mm, (3/8” drive) 7mm, 8mm, 9mm, 10mm, and 12mm, and (1/2" drive) 14mm, 15mm, 17mm, and 19mm.