Lapidary Tools,Carbide Rotary File, Cutting Tools These dental carbide burrs feature an extra coarse, coarse, double cut, fine, medium fine and super fine pattern, developed for finishing stone & plaster, chrome and cobalt alloys, ceramics, and other precious metals. 1. Dimensions: a) Shank diameter: the burs are ISO# 104 Hand piece shank(2.35mm or 3/32 inch diameter) b) Length: 45mm