EnPoint&trade;TiN Coated Tungsten Carbide Roughing Milling Cutter w/Locating Ring 1/8" Shank 0.8mm Cut Dia 5.5mm Flute Length Corn End Mill CNC Threading Bit for PCB PVC Carbon Fiber Hardwood Plastic Made of Tungsten steel. Coated with TiN. Durable service and long lifespan. Shank Diameter(SD): 1/8 inch; Cutting Diameter(CD): 0.031 inch/ 0.8mm Flute Length(FL):0.217 inch/5.5mm; Overall Length(OL): 1.496 inch/ 38mm Locating ring will fix and adapt the tool and reduce the debug time Ideal for PCB, PVC, Plastics, Carbon Fiber, Hardwood, Plywood and other composite panels