Tonsiki 14 Pcs 1/4" Hex Power Nut Driver Drill Bit Set Metric Socket Wrench Screw Quick-Change Hex Keys Material: chrome vanadium steel Shank length: 0.08inch(2.2mm),Shank diameter: 1/4 inch(6.35mm) 7 Pieces Power Nut Driver Bits (Inch):3/16" ,1/4", 9/32" ,5/16" ,11/32" ,3/8" ,7/16" 7 Pieces Power Nut Driver Bits (Metric):5mm 5.5mm 6mm 7mm 8mm 10mm 12mm It is applicable for installing in those hexagon tools, such as pneumatic screwdriver, electric screwdriver, pneumatic drill, electric drill, pistol drill, manual screwdriver, etc.It's widely used in household DIY, auto parts, woodworking, professional machine repairing, etc.