Premium 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 finish and resistant to corrosion to make it more durable. [Easy to use] The socket kit is easy to install and disassemble, and does not easily fall off when using. The nut driver socket wrench set is very occlusive, firm and flexible. Each plug has an obvious size mark, you can quickly find the socket you need. 1/4 Hex Shank: This hex socket nut is suitable for installing in hex tools such as air screwdriver, electric screwdriver, air drill, electric drill, gun drill, screwdriver manual and much more. 7 pieces. Power socket 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 the hex drill bits are sufficient to meet your daily needs. Versatile: Universal 1/4 hex bits accommodate quick changes and securely clamp into standard