【High-quality Material】The socket set for impact driver is made of high-quality chrome-vanadium steel,which has extra high hardness, and good abrasion resistance. With the polished corrosion-resistant sandblast finish to make it more durable. 【Easy to Use】The nut driver bit set is easy to be installed and dismantled, not easy falling off when it was using. The nut driver socket set is high occlusion, tight and flexible. Each socket has an obvious size mark, you can quickly find the socket you need. 【1/4" Hex Shank】This hex shank bit socket metric is suitable for installing in those hexagon tools, such as a pneumatic screwdriver, electric screwdriver, pneumatic drill, electric drill, pistol drill, manual screwdriver, and more. 【Size Ranges】7 pcs power nut driver bits(Inch): 3/16", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16"; 7 pcs power nut driver bits (Metric): 5 mm, 5.5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm. The multiple sizes of hex drill bits set are sufficient to meet your daily needs. 【Multi Purpose】Universal 1/4 '' hex shanks adapt to rapid changes and securely secure in standard chucks, suitable for any drill, screwdriver and screw gun. Widely used in domestic DIY, auto parts, carpentry, professional machine repair and more., Manufacturer: PanBeiQi