Extensions in lengths 50mm 60mm 100mm 150mm 300mm for superior access for hard-to-reach fasteners Made of high-quality materials, . Suitable for: pneumatic air batch, electric drill, charging drill, electric screwdriver and so on. Magnets hold bits securely in place; accepts all 1/4inch hex-shank bits 1/4inch quick-change hex shanks fit all power drills, 1/4inch impact drivers and hand-held drivers, Weight: 0.43431065614 Pounds, Manufacturer: Ehwisbe