... Ideal for quickly and easily removing broken, damaged or embedded screw. Screw extractor.Size: 3-6, 6-8, 8-11, 11-14 ... 18-25, 25-35, 35-50mm.1/8"-1/4", 1/4"-5/16"-7/16", 7/16"-9/16", 9/ ... 16"-3/4", 3/4"-1", 1"-1-3/8", 1-3/8"-2 ... and easily removing broken, damaged or embedded screw. Suitable for use with all standard variable speed drill. Screw extractor / damaged screw remover