Five (5) CNC bits included: Flat End Mill (Single Flute, Cutting Diameter 1.5 mm) Flat End Mill (Double Flute, Cutting Diameter 3.175 mm) Flat End Mill (Single Flute) Ball End Mill Carving V-Bit Overall features: General-purpose end mill with 3.175 mm shank. UF20 tungsten steel alloy, with high hardness and wear resistance Compatibility: Snapmaker 2.0 Snapmaker Original General-purpose End Mill With a shank diameter of 3.175 mm, the bits in this set are compatible with both Snapmaker Original and Snapmaker 2.0. UF20 tungsten steel alloy UF20 tungsten steel alloy with high hardness and wear resistance, providing a long service time. Flat End Mill Typically used for roughing operations, cutting 2D shapes and flat-sided 3D shapes. Ball End Mill With a round cutting edge, typically used for cutting curvatures and 3D shapes into materials. Carving V-bit With a narrow and sharp tip, used for carving intricate, detail-rich patterns. Flat End Mill (double cut) Shank Diameter: 3.175 mm / 0.125 " Total Length: 38 mm / 1.496 " Flute Length: 12 mm / 0.472 " Cutting Diameter: 3.175 mm / 0.125 " Flat End Mill (single cut 3.175) Shank Diameter: 3.175 mm / 0.125 " Total Length: 38 mm / 1.496 " Flute Length: 12 mm / 0.472 " Cutting Diameter: 3.175 mm / 0.125 " Flat End Mill (double cut 1.5) Shank Diameter: 3.175 mm / 0.125 " Total Length: 38 mm / 1.496 " Flute Length: 12 mm / 0.472 " Cutting Diameter: 1.5 mm / 0.059 " Ball End Mill Shank Diameter: 3.175 mm / 0.125 " Total Length: 38 mm / 1.496 " Flute Length: 17 mm / 0.669 " Cutting Diameter: 3 mm / 0.117 " Carving V-bit Shank Diameter: 3.175 mm / 0.125 " Total Length: 32 mm / 1.260 " Angle: 30 ° Tip Diameter: 0.2 mm / 0.008 "