I have a set of 9 JEFE HEX-1/16", 3/32", 1/8", Receive 5/32", 3/16", 7/32", 1/4", 5/16", 3/8", Hex Quick Change Shank, HSS Titanium Twist Drill Bit Set, 135 degree tip easy cut column perfect for wood steel copper aluminum zinc alloy plastic lately and I haven't been disappointed with them they work great I've been looking The hex shank makes it quick and easy Switching Drills In and Out These drills have been used to press various things including plastic, wood and many different metals and I would recommend them.