This combination drill and tap set is made of high speed steel and has a ¼ inch diameter shank. It includes a plastic case, #10-24, #10-32, #12-24, #8-32, ¼"-20, ¼"-20, #10-24, #10-32, #12-24, #8-32. This combination drill and tap set has a bright (uncoated) finish, and has fractional inch measurements. It has right hand direction.