Industrial quality aluminum cutting router bits are made by Amana Tool, the leading manufacturers of high quality wood cutting tools. Amana Tool 51402 SC Spiral 'O' Single Flute, Aluminum Cutting 1/4 D x 5/8 CH x 1/4 SHK x 2 Inch Long Up-Cut Router Bit with Mirror Finish uses the highest quality sub-micrograin carbide, has a special proprietary edge processing system and features 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. The spiral O flute sharpening/finishing process increases feed rates, allowing for more linear feet routed in less time. Excellent for: ALPOLIC Copper Composite Material (CCM), Alucobond, Aluminum, Aluminum 6061, Aluminum Alloys (Al-Alloy), Aluminum Composite Materials (ACM), Aluminum Composite Panel (ACP), Alupanel, Brass, Copper, Dibond, Durabond, e-panel, Etalbond, Gold, Non-Ferrous Metals, Plastic, Silver, Solid Surface, Titanium Composite Material (TCM), Wood. SPECIFICATIONS: Direction: Up-Cut; (D) Diameter: 1/4; (B) Cutting Height: 5/8; (d) Shank: 1/4; Overall Length (L): 2; Flutes: 1.