Trend Professional HSS Router Cutters 56/3X1/2HSS - Acrylic Spiral 4 Flute 12.7mm Diameter x 45mm Cut Key Features: Four fluted up-cut spiral router cutter for acrylic plastic (cast or extruded) Can be used to trim, rebate and surface Can be used to ramp plunge cut Will rout low melting point plastics with shallow passes (not plunge cutting or surfacing) Use in a router table Recommended speed 18,000 rpm Specification: D: 1/2 inch (imperial diameter) D: 12.7 mm (metric diameter) C: 45 mm (metric cut length) OL: 103 mm (overall length) Shank Diameter: 1/2 inch