High-quality material: the impact screwdriver bit holder is made of high-quality carbon steel with particularly high hardness and good abrasion resistance. Polished sandblasted finish and corrosion resistant to make it more durable. Easy to UseThe socket set is easy to install and disassemble and is not easy to fall off during use. The nut socket set is very occlusive, firm and flexible. Each socket has obvious size marking, you can quickly find the socket you need. 1/4" hex shank: This hex socket is suitable for installation in hexagonal tools such as air screwdriver, electric screwdriver, air drill, electric drill, pistol drill, manual screwdriver and much more. Size Range 7pcs. Power socket wrench adapter (inch): 3/16", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16"; 7 drive nuts (metric): 5mm, 5.5mm, 6mm, 7mm, 8mm, 10mm, 12mm. The different sizes of hex drill bits are enough to meet your daily needs. Multi-use Universal 1/4" hex shanks accommodate quick changes and are securely fixed in chucks standard which are suitable for all drills, screwdrivers and screw guns. Widely used in household items, auto parts, carpentry, professional machine repairs and much more.