Just doesn't hold a round shank drill securely. Hex shank bits should be fine though. EDIT: Literally useless for round shank bits. This is another "tool" that will be at the bottom of my toolbox until after I die, it's sold for a penny at my estate sale. He will then sit at the bottom of that buyer's toolbox until his property is sold. Well you get the idea. It is passed from generation to generation and will live forever!