Bests & Worsts Reviews from Amazon

It might be good for plastic, woods and aluminum but defiantly not that strong for steel. I usually buy my drill bits from Lowe’s or home depot and it gets the job done and last longer. I’m a locksmith and I drill locks and metal doors fram for locks installations. These drill bits did not hold for the first time I tried to drill a security door fram. One by one most of them just broke off before I completed my project. I do not recommend if need to use on steel materials.