[Hex Shank Diameter] These 1/4 hex shank nut drivers come with 14 drill bits. Stem Diameter: 6.35mm Stem Length: 2.2cm NOTES: Without Magnet! [High Hardness and Quality] The socket wrench bit is made of industrial grade chrome vanadium steel with high hardness after being forged and quenched at high temperature. The surface has been sandblasted for durability against corrosion and rust. [Various Sizes] The hex screwdriver set includes different sizes to meet your needs. Power Nut (SAE) screwdriver bits: 3/16, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16 inch; Power Nut Screwdriver Bits (Metric): 5mm 5.5mm 6mm 7mm 8mm 10mm 12mm [Wide Application] Hex Driver Bit fits any electric drill or drill chuck, such as: air drill, electric drill, hand screwdriver, screwdriver. Widely used in auto parts, woodworking, DIY, machinery repair and maintenance. [Easy to Store and Carry] The screwdriver bit set comes with a storage organizer, each driver bit nests against the organizer. Size marking on organizer