This M2 straight flute tap is made of high speed steel and has a 0.255 inch diameter shank. It is designed for use with all materials, and meets ANSI standards B94.9-2008. This 311-90705 series straight flute tap has a bright finish, and has fractional inch measurements. It is non-coolant through, has right hand direction with a 2½ inch length. Plus it has two flutes and a straight shank.