The Faithfull screw extractor kit easily removes the most damaged and hard to remove screws and bolts. Works on pozidrive, phillips, flat, hex and star headed screws and bolts. Works on jagged and uneven breaks. Removes screws from wood, metal or plastic. Removes screws manufactured from any alloy including soft brass. Removes free-spinning screws. Self-centring tip. Manufactured from hardened tool steel and double tempered for extra hardness. Four piece set containing sizes 1, 2, 3 & 4. For use with power drills.