Increases your efficiency : Thread-conserving removal of the screw without damage. Product dimensions : 100 x 6 x 6 mm (LxWxD) Application : For thread-preserving removal of damaged screws with left-hand or right-hand thread, particularly stripped hex screws. Material : Tough-yet-flexible chrome-vanadium molybdenum steel, through-hardened, bronzed. Replacement screw extractor drill for the screw extractor set. Contains 1 piece.