Review on Ultimate Precision: COMOWARE Titanium Twist Drill Bit for Exceptional Results by Luis Esquivel

Maybe good for plastic, wood and aluminum but obviously not as strong for steel. I usually buy bits from Lowe's or a hardware store and they do the job and last longer. I'm a locksmith and I drill metal locks and door frames to install locks. These drill bits didn't hold up the first time I tried drilling through the door frame. One by one most of them just broke down before I finished my project. I do not recommend using them on steel materials.