Industrial quality aluminum cutting router bits are made by Amana Tool, the leading manufacturers of high quality wood cutting tools. Amana Tool 43530 SC Spiral 'O' Single Flute Straight Grind Aluminum Cutting 1/8 D x 1/2 CH x 1/4 SHK x 2 Inch Long Router Bit with Mirror Finish is combining ?mirror finished? fluting which insures the best of cutting edges possible in a solid carbide tool, along with a strong, straight-fluted design, these aggressive ?O? flute tools will give longer tool life. Excellent for: Aluminum, Natural Wood. SPECIFICATIONS: Diameter (D): 1/8; Cutting Height (B): 1/2; Shank (d): 1/4; Overall Length (L): 2; Flutes: 1.