Specification 5Pcs 10mm Magnetic Hex Nut Driver Main Material:Chrome Vanadium Steel Features: Magnetic Main Color: Grey Socket Type: Hex Socket Shank Size: 6.35mm / 1/4" Hex Socket Size: 10mm/0.4" Overall Size: 65 x 13mm/4" x 0.5"(L*D) 1. Strong magnetism for convenient operation. 2. Anti rust & anti slip & flexible. 3. Fitting most powered corded or cordless drills with 1/4" shank. Kindly Note: Please allow 1-2mm errors due to manual measurement, thank you for your understanding!