A TORX head lets you set a screw down tight without the bit slipping and damaging the screw slot. They give your work a clean, finished appearance. T-10 gives you plenty of additional wall thickness where the head joins the shank; T-15 has a large socket that accepts the same driver supplied with many popular brands of rings and bases. All screws are made right here in the USA. The Weaver Ring/Burris Ring alt hd screws must have the head diameter reduced to fit the Burris rings.
