3/4 Dia. 1.625 Flute Length Fine Pitch 3/4 Shank 4.0 OAL AlTiN coated center cutting. LakeShore Carbide end mills are made from the highest quality micro grain carbide and coatings to deliver the performance of the big name endmills at a little guy price. 30 degree helix and AlTiN coating help maximize production in a wide range of materials. An excellent performance endmill made in the USA.