Deburrs inside and outside edges of 1/2", 3/4" and 1" thin wall conduit. Hooded tip tightens EMT fitting set screws without slipping. Square tip “seats” much more quickly on fitting screws than slotted version. Head 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 screwdriver. The 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.