7pcs Hex Head Allen Bit Set 100mm/4 inch Long Metric H2-H8 Quick Release Shank

Made of high grade S2 steel ,heat treated for durability,hardness reached 61RCH,adapt to high strength working conditions,Perfect for Production Workshop 7pcs set, includes all of the most popular sizes:2mm (H2) 2.5mm (H2.5) 3mm (H3) 4mm (H4) 5mm (H5) 6mm (H6) 8mm (H8) The whole body of hex bit is magnetic,the bits can be firmly fixed on screwdrivers and keep screws stuck to them,can improve your work efficiency Special surface coating treatment, with strong anti-rust ability These 4 inch hex head allen bits fit for electric screwdrivers,hand screwdrivers,electric drills,air drills,cordless drills,impact drivers and so forth