I bought this 1/2" Steelex drill bit and a 3/8" Steelex drill bit at the same time to drill screw holes in hot rolled angle steel for small Screws to drill home project (only about 30 holes). I drilled a 3/16" pilot hole with a DeWalt "Point" drill bit and then drilled the hole with a 3/8" drill bit and it cut through very quickly. As soon as I started working with the 1/2" nozzle the tip broke off (about an inch). I'm done with my DeWalt bits and will never buy a Steelex bit again.