Well I finally got burned. meaning a cheap product i bought from amazon thinking it would be just as good as a famous brand. nope I'm not going to totally hate these bits because I think you'll be fine with them as long as you don't plan on using them on metal. hole instead of drilling with them. Anyway, I'm not a husband who works with his own hands on weekends, doing crafts and hobbies for his wife. I'm a general contractor with 16 years of experience so I know how step drills are supposed to work. I have tried using the largest and most powerful Makita drills with oil, no, fast and slow. My advice, save money and buy a big brand.