Suitable material: Nylon, resin, acrylonitrile butadiene styrene, acrylic, PVC, MDF wood, hardwood and other three-dimensional carving, surface machining, etc. Chip Removal: The CNC design profiling cutter is the oversized spiral and discharge chip, which prevents the cutter from sticking, thereby increasing the production yield. Perfect cut: The profiling cutter allows for smooth cutting, makes the grit non-sticky, non-black, and increases the speed. High quality and durable: These engraving bits have sufficient bending strength and wear resistance for precision engraving of various materials. Enough to replace: Includes 12 cutters in three sizes for durable use. Product Description Features: 1/8" Double Flute Tungsten Carbide CNC Router Bit: Shank Diameter (SD): 3.175mm approx. Cutting Edge Diameter (CED): Approx. 3.175mm. Cutting edge length (CEL): approx. 17 mm. Item Length: 38.5mm Made of solid carbide Ideal for 3D relief carving, cutting, engraving, grooving, milling, etc. Single-edged milling cutter (3.175 x 2 x 8 mm): Material: tungsten steel, rust-proof and anti-static Color: see photo Total length: 38.5 mm Cutting edge length (CEL) - Flute length: 8 mm Shank Diameter (SD): Approx. 3.175mm Cutting Diameter: 2mm Single Edge End Mill: Material: Tungsten Steel Color: See Photo Overall Length: 38.5mm Cutting Edge Length (CEL): 17mm Shank Diameter (SD): Approx. 3.175mm Contents: 4 x 1/8" CNC Carbide Double Flute End Mills 4 x Single End Mills (3.175 x 2 x 8mm) 4 x Single