10pcs metric impact hex head allen wrench drill bits set: 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 8mm, 10mm. 1/4” quick release hex-shank, 4” long. Extended length to meet more needs. This 4 inch long hex bits is longer than others, extra length provide additional clearance for reaching into tight spaces.Surpassing market standards for practicality and convenience. The hex bit set are made of S2 alloy steel, used CNC precision technology, and heat treatment process that gives them a hardness of hrc60. The high torsion and proper hardness avoid the bits break and wear.Phosphate black surface to prevent rust. Boost your work efficiency with our magnetic screwdriver bits, keeping nuts and bolts securely in place as you work. Allen key drill bit set fit for electric drills with speed regulating device, electric screwdrivers, hand screwdrivers. This allen key drill bit set is ideal for impact driver and heavy screw driving, widely used in home repairs, DIY projects, woodworking, automobiles maintenance and other screw driving applications. Materials: S2 Steel

Type of head: Hex

Type of shank: 6.35mm / 1/4 inch

Length: 100mm/4 inch

Model: 10mm, 8mm, 6mm, 5mm, 4mm, 3.5mm, 3mm, 2.5mm, 2mm, 1.5mm

Packing Includes: 10 Pieces Allen wrench drill bit