Gedore Left-hand screw extractor Description · for removing broken screws, bolts and pipe ends · made from high-quality chrome vanadium steel, hardened, 54-56 HRC · low unscrewing torque due to new cross-section geometry · low drilling depth due to optimized thread length · increased safety for users and the part to be loosened · wider range of applications, time saving Technical data8551 Sdiameter (d, d2) 4.5-13.0 mm drive 4-square nominal size 4.9 mm length (l, l1) 64 mm bolt/screw size M8 - M11 drill 6 mm