Carbon-titanium drill bit, diameter = 4 mm, universal

Chrome-vanadium steel shank
Plate made of special steels: cobalt and titanium-tungsten, providing maximum hardness, wear resistance, and temperature resistance
Drill bit for drilling holes in a wide range of materials such as glass, porcelain, ceramics, concrete, marble, cast iron, wood, plastic, fiberglass, granite, laminate, hardened steel