Material: Carbide (tungsten steel); Surface treatment: titanium plaster; Color: Silver stem diameter: 3.175mm; Total length: 37mm (please receive the promo code on the product page when purchasing to obtain a more advantageous price.) Diameter of the cut edge: 0.8-3.175 mm (0.8 / 1, 0 / 1.2 / 1.4 / 1.6 / 1.8 / 2.0 / 2.2 / 2.4 / 3.17 mm); Cutting edge length: 12mm The use of ultra-fine grain carbide with good milling performance, cutting, ensures great work efficiency; Have a resistance to flexion and resistance to sufficient wear; Sharp cutting edge, tender, hole and flat edge, clean surface, clean, no glitches. Application: PCB, SMT, CNC, computer control by computer, mold, pastic fiber, carbon fiber, super hard wood, Printed circuit, other precision parts treatment