Specifications: 1) Diameter: 6mm, 8mm, 10mm, 11mm, 12mm, 13mm (1/4", 5/16", 3/8", 7/16", 15/32", 1/2") 2) Length: a) 34mm, 36mm, 38mm (without magnet ) b) 42mm, 45mm, 48mm, 65mm, 100mm, 150mm (with magnet ) 3) Application: for power driving hex head screws, bolts and nuts 4) Material: 45# carbon steel or CRV (chrome vanadium alloy steel) 5) Surface treatment: Sandblasted, Zn-coated, Ni-coated, Bright finished Packing: Double blister, plastic bag, skin card, in set or others