1/2 inch Drive Hilka 'Pro-Craft' Impact Driver Set for cracking off/removing those seized screws. This tools is to be used in conjunction with a hammer. You place the correct bit size on the Driver place it on the screw to be removed then hit the Driver hard with a hammer to loosen the seized screw. Heavy duty 1/2" driver with knurled grip. Reversible (Left or Right Handed Thread). Contains 13 Bits in Sizes: Slotted: 5,6,8mm Pozi: No 1,2,3 Philips: No 1,2,3 Torx: T20 T25 T30 T40. Inc a Handy Storage Case. Brand: Hilka Pro-Craft. .