Astro Pneumatic 8pc Burr Set / 1/4" Die Grinder Combo. * Set includes 8 piece double cut Carbide Rotary Burr Set with 1/4" Shank plus a composite body 1/4" medium die grinder with rear exhaust safety lever. * Burr set includes blow molded case for easy storage and transportation. * All Burrs are 1/4" shank. * AST2181A