I was trying to drill a hole in a 3/16 inch piece of A-36 high carbon steel. This drill didn't even make a single hole. At that time I bought several drills. . Tried another racquet and went through steel like butter Conclusion: This bit doesn't work. LET YOU KNOW I USE THE ROCKWELL DRILL ON THE SLOWEST SETTING. ABOUT 250 RPM WITH LARGE OIL. TO KID. UPDATE: AFTER READING THE REST OF THE REVIEWS, I NOTED THEY ARE FREE TO REVIEWERS. THIS ALL DEAL WAS A JOKE. COMPLETE WASTE OF MY TIME FOR THE JOKE OF THE PRODUCT.