Deburrs inside and outside edges of 1/2 in., 3/4 in. and 1 in. thin wall conduitHooded tip tightens EMT fitting set screws without slippingSquare tip seats much more quickly on fitting screws than slotted versionHead removes and is interchangeable with IDEAL 7-in-1 Twist-a-Nut Screwdriver shaft (#35-908)Head can be used at low speed setting in drill or cordless screwdriverThe Twist-a-Nut Conduit deburring tool head is used with IDEAL 7-in-1 Twist -a-Nut screwdriver shaft to smooth inside/outside edges of conduit. It can be used with drill or cordless screwdriver.