Norton Pacesetter Vitrified Bond Abrasive Mounted Point, Aluminum Oxide, W163 Shape, 1/8" Spindle Diameter, 1/4" Diameter, 1/2" Thickness, Grit 60 (Pack of 5) 38A abrasive is cool cutting, less burn^Diverse shapes and sizes^Ideal when initial price is the main consideration^Great choice for small job shops^Standard shank size is 1/8" x 1-1/2", maximum operating speed based on 1/2" overhang