Product Description: Item Name: Hex Chuck. Material: 40CR Tool Steel. Color & Size: As Shown the photo. Contents: 14 hex sockets High-quality material: the impact driver bit holder is made of high-quality chrome vanadium steel with particularly high hardness and good abrasion resistance. With the polished and corrosion-resistant finish to make it more durable. Easy to UseThe socket kit is easy to install and disassemble and does not fall off easily when using. Nut Driver Socket Wrench Kit is very occlusive, firm and flexible. Each socket has an obvious size mark, you can quickly find the socket you need. 1/4" Hex Shank: This hexagon socket nut is suitable for installing in tools hexagonal tools such as air screwdriver, electric screwdriver, air drill, electric drill, gun drill, manual screwdriver and more. 7 pieces. Power Socket Wrench Adapter (inches): 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. Different sizes of hex drill bits are enough to meet your daily needs. Versatile: Universal 1/4" hex bits accommodate quick changes and are securely clamped in standard chucks that fit to all drills, screwdrivers and screw guns. Widely used in household goods, auto parts, carpentry, professional machinery repairs and much more.