Features: 1.Wide Application: The socket chuck adapter is extensively used in mold manufacturing, pneumatic screwdriver, DIY, auto repair and other professional machine maintenance. 2.One Piece Design: Make use of advanced hot forging technology to form one piece, which strengthens the density of the main material and greatly increases the strength and durability. 3.High Quality Materials: The heavy duty hex drill bit set is exquisitely constructed from chrome vanadium alloy steel with excellent wear resistant which will reduce the screw slippage. 4.Square Hole Design: The square hole is set with clamp pad in the square hole, which makes the clamp more firm, greatly provide you with more convenience. 5.Match to Use: The high hardness power drill socket set is used with hand electric drill (not included), in order to maximize the working efficiency. Specification: Item Type: Power Drill Socket_x000D_ Material: Chrome Vanadium Alloy Steel_x000D_ Size: E4 E5 E6 E8 E10 E12 E14_x000D_ Shank Diameter: Approx. 6.35mm / 0.25in_x000D_ Surface Treatment: Blackening and rust prevention_x000D_ Hardness: 60-62_x000D_ Function: Suitable for disassembly and installation of most of car hexagonal torx anti theft screws on the market. PackageList: 7 x Power Drill Socket 1 x Rubber Base