Drillpro Damaged Screw Remover Extractor Set by Mring Set Screwdriver Bit Sets Screw Remover Drill 1/4'' Hex Shank ( 5PCS ) Specification: 0 #, 1 #, 2 #, 3 #, 4 # Handle: hex shank 1/4 '' (6.35MM) Material:HSS4241 Suitable for with the joint or chuck an electric power tool, and suit for remove the screw or bad nut screw on a hard wood.