The MILWAUKEE 4PC M2 Steel Screw Extractor Set is a complete solution, featuring a double-ended bit design, for easy removal of stripped screws and rounded bolts. The screw extractors are made from M2 Steel for maximum durability in hardened screws and bolts. Designed for use in drill drivers in reverse. Extracts No.4 No. 24 screws and No. 10, , 5/16, and 3/8 bolts. Includes (4) sizes: #1, #2, #3, and #4 for common extractions.