Cyclone HSS Premium Grade Annular Cutter, 3 4 in dia x 2 in Depth, 3 4 in Weldon Shank, Includes Pilot Pin ORS NASCO Constructed of heavy duty barktan Constructed of heavy duty barktan strap leather Heavy duty steel rivets and hardwood bottom Includes leather divider for organization and belt loop Convenient for keeping rods A high viscosity Evolution standard geometry is sufficient for most drilling applications Manufactured specifically to maximize hole accuracy while minimizing cutter vibration and extending annular cutter life Using this standard geometry enhances accuracy and saves time This allows for a single ejection of slugs when drilling through stacked material