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(4.76mm),1/4(6.35mm),9/32(7.14mm),5/16(7.93mm), 11/32(8.73mm),3/8(9.53mm), 7/16(11.11mm), 5mm,5.5 mm,6mm,7mm,8mm, ,12mm. It’s made of chrome-vanadium steel with long life and great durability for use. Easy to install on the screwdriver handle. Widely used in household DIY, woodworking, parts, professional machine repairing, etc. Features - Color: As shown - Material: Chrome-vanadium steel - Package Size: 12.5 x 11.5 x 2cm - Inner Hole diameter: 0.6mm - Weight: 201g - Made of chrome-vanadium steel with long life 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. - 14 Pcs bit sockets include: 3/16(4.76mm),1/4(6.35mm),9/32(7.14mm),5/16(7.93mm), 11/32(8.73mm),3/8(9.53mm), 7/16(11.11mm), 5mm,5.5 mm,6mm,7mm,8mm, ,12mm - Wide application. Suitable for household DIY, woodworking, parts, professional machine repairing, etc. Package list: 14 x socket