To be used only on CNC machines and routers with automatic feeding.Using the highest quality sub-micrograin carbide These bits have a special proprietary edge processing system featuring a super high polished cutting edge with a unique “mirror finish” Resulting In clean cuts, less chance for chip re-welding, a superior surface finish and a longer tool life. Right hand helix right hand cut. Specifically designed for a variety CNC machining applications Excellent for cutting, #AMS-160, (D) shank: 1/4, AMS-160 8-pc aluminum Cutting Solid Carbide spiral o Flute CNC router bit Collection, 1/4 inch Shank