Total Quantity of Screwdriver Bit: 20pcs; Head Type: Hex; Hex Shank Diameter: 6.35mm (1/4"); Length: 60mm (2.36") SAE (Imperial) Size: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16 inch; Metric Size: 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10, 12mm High quality s2 steel hex screwdriver bits, high temperature quenching treatment, wear-resistant and impact-resistant, durable and suitable for industrial use. Strong magnetic, high precision, good workmanship, each edge of the screwdriver bit head can lock the screw precisely without damaging the screw and screwdriver head You can use the screwdriver bit on hand tools and easily insert it into 1/4" hex shank power tools (e.g. electric screwdrivers, hand screwdrivers, pneumatic drills, etc.) Specifications Material: s2 alloy steel Head type: hex Shank type: hex Shank Diameter: 6.35mm (1/4 inch) Total Length: 60mm (2.36 inch) - Hex Head Diameter - SAE Sizes: 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16 Metric Size: 1.5mm, 2mm,