Spiral router bits are made by Amana Tool, the leading manufacturers of high quality wood cutting tools. Amana Tool 46373 Solid Carbide Double Flute Up-Cut Ball Nose Spiral 1/32 R x 1/16 D x 1/4 CH x 1/8 SHK x 2 Inch Long Router Bit leaves an excellent finish and expels chips quickly. Used for carving, decorative doors and sign manufacturing. Excellent for: Aluminum, MDF, Sign Foam, Soft/Hard Plastic, Soft/Hard Wood. SPECIFICATIONS: Direction: Up-Cut; (D) Diameter: 1/16; (R) Radius: 1/32; (B) Cutting Height: 1/4; (d) Shank: 1/8; Overall Length (L): 2; Flutes: 2.