- Set of 20 PCB drill bits made of tungsten carbide, with diameters from 1.1 mm to 2.0 mm (2 units per size) - High hardness and wear-resistant material, ideal for precise drilling in CNC, engraving, and jewelry - Sharp cutting edges and spiral flute reduce cutting force and prevent breakage - Improves hole wall quality and machining accuracy, with no burrs or chips - Includes durable plastic case for easy transport and protection of the drill bits - Compatible with PCB drilling machines, engraving equipment, and high-precision CNC tools - Recommended for cleaning 3D printer nozzles, circuit boards, bakelite, plexiglass, jewelry, metal, and plastic - Versatile set with 10 different sizes, suitable for multiple professional and DIY applications