This of screwdriver bits 1/4 inch tools fits most powered corded or cordless drills to drive head screws. Strong inner hexagon sleeve without . The specifications of the bits inlcude 3/16 inch (4.76mm), 1/4 inch (6.35mm), 9/32 inch (7.14mm), 5/16 inch (7.93mm), 11/32 inch (8.73mm), 3/8 inch (9.53mm), 7/16 inch (11.11mm), 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm, 12mm. It’s made of chrome-vanadium steel with and great durability for use. Easy to install on the screwdriver handle. Widely used in household DIY, woodworking, auto parts, professional machine repairing, etc. Features - Color: As shown - Material: Chrome-vanadium steel - diameter: 6.3mm - length: 20mm - Made of chrome-vanadium steel with and great durability for use. - Strong inner hexagon sleeve without . - This of screwdriver bits tools fits most powered corded or cordless drills to drive head screws. - The specifications of the bits inlcude 3/16 inch (4.76mm), 1/4 inch (6.35mm), 9/32 inch (7.14mm), 5/16 inch (7.93mm), 11/32 inch (8.73mm), 3/8 inch (9.53mm), 7/16 inch (11.11mm), 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm, 12mm. - Wide application. Suitable for household DIY, woodworking, auto parts, professional machine repairing, etc. Package list: 42 x Impact Driver Adapter Drill Bit