Description:M3\/M4\/M5\/M6\/M8 HSS Nitride Coated Screw Tap Metric Spiral Hand Thread Screw TapSpecification:          Material       HSS           Surface treatment       Nitrogen Treatment           Thread Diameter       3mm、 4mm、 5mm、 6mm、 8mm       Features:-Nitridation surface of the product、 it's higher accuracy、 and more durable. -Growth in the service life and cutting out the highest accuracy of the thread. -Spiral screw is suitable for cutting materials with high toughness、 and is not suitable for cast iron scraps into fine materials. -Easy to drill the bottom. -Fine cutting and the chips will not stay.      Note: Please note that the package includes one tap only.  Package Included: 1 x Spiral Pointed Tap  More Details: