tap Matrial:M2,M35 Coated:black coated ,Tin coated Standard:USA, ... 2.Machine taps 3.DIN371/DIN376 4.machine tap with sprial flute 5.machine tap with straight flute with outer boxthe main ... .00M18X2.50M20X2.50M22X2.50M24X3.00M27X3.00M30X3.50M36X4.00M39X4.00M42X4.50...... tap