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Features: The diameter of the drill bit and the recommended broken screw extraction diameter etched on the case Easy-to-use, simply drill a hole in the center of broken screw first with proper drill bit, then use a proper extractor to removes broken bolts and screws quickly Material: Chrome vanadium steel Extractor Diameter: E#1 for 1/8"-9/64" (M3-M3.5) E#2 for 5/32"-11/64" (M4-M4.5) E#3 for 13/64"-9/32" (M5-M7) E#4 for 5/16"-23/64" (M8-M9) E#5 for 25/64" -15/32" (M10-M12) Drill Bit Diameter: D#1: 5/64" (2.0mm) D#2: 7/64" (3.0mm) D#3: 5/32" (4.0mm) D#4: 1/4" (6.5mm) D#5: 19/64" (7.5mm) Tap twist size: 7.5" (190mm) How to use: 1. Drill holes on the screw bolt 2. Punch the Square Nut Drill Bit into the bolt 3. Use the Drill Bit holder wrench to extract the broken screw through the Drill Bit