Rectorseal 87011 pro-fit drill bit swage kit 1/4", 3/8”, 1/2", 5/8”, 3/4”, 7/8” includes one each 1/4", 3/8”, 1/2", 5/8”, 3/4”, 7/8” drill bits save both time, at least 5 times faster than other methods and money, stop buying expensive consumable couplings creates precise and fast standard swage in copper and aluminum line sets for mini-split HVAC units the hex swage bit forms a consistent swage without splits, burrs, blemishes or uneven edges that typically cause fitting connection leaks use with your high RPM (minimum 2000 RPM, 12 Volt cordless) drill without additional specialized tool kits