ITEM NAME:7Pcs 3mm-12mmm HSS Nitriding Metric Spiral Flute Screw Drill Thread Tap M3-M12.The application of nitriding enhances the abrasion performance, surface hardness, fatigue limit, anti erosion ability of the tapping. 7 x Nitriding HSS Screw Thread Tap. Spiral screw is suitable for cutting high toughness material.
