1.Made from HSS carbon steel, tempered twice, durable and sturdy. 2.Broken Wire Extractor AD 3MM-10MM With High Hardness Machine Repair Broken Head Screw Extractor 3.Drill bits' diameters and recommended extract diameters of broken screws are etched on each tool. 4.Designed to remove damaged, rusted or stripped screws, studs, bolts, fastener, metal water tap and water tube, etc. 5.used to bore holes on wood, metal, plastic, brick and wall, etc. Drill: High Speed Steel Screw Out Size : 3-10mm Drill Bits Size:1#,M3-M3.5,2#-.5,3#M5-M7,4#M8-M9,5#M10-M12 Colour:Green Material:steel Package Contents: 5 x Drill Bits 5 x Extractors 1 x Holder Frame 1 x box Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.