... flute 3.Fully ground 4.TiN, TiAlN Coating HSS Taps Threading Tools :1) Material:HSSM2,M352.Straight flute ... taps), HSS-M2, HSSCo5-M35, Carbide (we use the best quality Chinese raw material) 2. Type: Straight flute, Spiral flute, Spiral pointed ... , Forming tap. ( machine taps or hand taps )3. Surface treatment: Black oxide, bright, TiN coating, ...