Features Premium Metal Material: Hex shank tap socket is made of alloy steel with high hardness and high wear resistance, sturdy and durable. High Performance: There are square holes in the apron, and there are card pads in the square holes to make the clamping more firm. Wide Applications: The tap socket set used with hand drill, widely used in mold manufacturing, pneumatic air screwdriver, DIY, auto repair and other professional machine maintenance. 60‑63HRC Hardness: Fully ground machine tap is made of 6542 high speed steel HSS material after overall heat treatment, the hardness reaches 60‑63HRC. Professional Made: The tap socket set come with wear resistance, long life, can attack superhard metal materials such as die steel and stainless steel. Specification: Item Type: Tap Socket Set Material: Alloy steel + high speed steel Socket Diameter Size: M4 M5 M6 M8 M10 M12 M14 M16 Hex Shank Diameter: 1/4in Function: Suitable for mold manufacturing, auxiliary tools for wire cleaning and wire returning after plating(painting) of male thread or female thread Package List: 8 x Socket 8 x Tap Package List 8 x Socket 8 x Tap