4241 high speed steel, golden color, titanium layer to reduce friction and run cooler.. Can use step drill bits to open hole before using the center punch. Adjustable automatic center punch. 1 package solves your 2 problems.. Universal shank type, sturdy and durable. 118 degrees to reduce slippage. Automatically deburr holes as you drill.. Widely used to cut holes in a variety of material like steel, wood, thin iron, aluminum alloy, insulation boards, PVC sheet, etc.. It is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc..
