For grinding FACES ONLY. Solid ball stops with 15-1/2° spacing allows fast and easy set ups for sharpening 2, 3, 4, 6 and 8 flute end mills. Fixture uses 5-C collets so that all end mills with shank diameters from 1/16" through 1-1/8" can be ground. Clearance and relief angles are built into solid 2-1/2" x 4-1/2" base having a ground bottom.