This fiberglass drill bit is made of carbide tipped and has a 7/16 inch diameter, 1¼ inch long shank. It is designed for use with fiberglass. This fiberglass drill bit has a bright (uncoated) finish, and has fractional inch measurements. It has a 12 inch length. Plus it has two 12 inch spiral flutes, a hex shank, a right hand cutting direction, and a carbide 2 point drill point.