Features: The Twotrees Four Milling Cutter Combination Set 40PCS has high hardness, high wear resistance, and high strength. Have sufficient bending strength and wear resistance. Can be used with 1610, 3018, 3018pro, 450, 450pro and other engraving machines. Advantage: Sharp cutting edge, milling, hole and plate edge, clean surface, neat, no glitches. Range of processing: PCB, SMT, the CNC, mold, plastic, aluminum and other precision parts processing. Use of ultra-fine grain carbide material with good milling, cutting performance, ensure high work efficiency. High hardness, high wear resistance, high strength. Have sufficient bending strength and wear resistance. Sharp cutting edge, milling, hole and plate edge, surface clean, neat, no glitches. Application: end mill is a good bit tool, drilling hole and milling for PCB, SMT, CNC, Mould, plastic, carbon fiber, wood, printed circuit board, other precision parts processing. Specifications: Material: Cemented Carbide Shank Diameter: 3.175mm(1/8inch) Length: 38mm Include: 40 * 1/8" End Mill 10pcs Ball Nose Bit 2-Flute Upcut: 3.175mm(SD) x 2mm(CED) x 17mm(CEL) x 38mm(OAL) 10pcs Flat Nose Spiral Bit 2-Flute Upcut: 3.175mm(SD) x 3.175mm(CED) x 17mm(CEL) x 38mm(OAL) 10pcs Titanium Coat End Mill CNC Router Bits: CED: 0.8-3.0mm (0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 3.17mm) 3.175mm(SD) x 12mm (CEL) x 38mm (OAL) 10pcs Titanium Coat End Mill CNC Router Bits: CED: 0.8-3.0mm (0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 3.17mm) 3.175mm(SD) x 12mm (CEL) x 38mm (OAL) 40pcs End Mill Engraving Bits Parameter: Overall Length (OAL): 38mm; Shank Diameter (SD): 3.175mm