16Pcs Tap Socket Set Machine Lengthened Tapping Chuck 1/4in Hex Shank Steel Hand Tools

1、WEAR RESISTANT ALLOY STEEL: Hex shank tap socket is made of alloy steel with high hardness and high wear resistance sturdy and durable 2、FIRM CLAMPING: There are square holes in the apron and there are card pads in the square holes to make the clamping more firm 3、WIDE APPLICATION: Used with hand drill widely used in mold manufacturing pneumatic air screwdriver DIY auto repair and other professional machine maintenance 4、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 5、FOR SUPERHARD MATERIALS: Come with wear resistance long life can attack superhard metal materials such as die steel and stainless steel