10 pcs solid carbide PCB drill bits with protective box Key specs - Cutting edge diameter: 0.25 mm - Cutting edge length: 6.4 mm - Shank diameter: 3.175 mm (1/8 in) - Total length: 38 mm (1.5 in) - Finish: titanium coating - Type: with positioning ring - Package: 10 pcs in protective box Why choose these - Solid carbide for high hardness, strength, wear and corrosion resistance, and excellent thermal stability. Delivers consistent cutting and long tool life with less risk of breakage. - Titanium coating lowers friction, reduces wear, and promotes smoother cutting, improving surface finish and machining accuracy. - Spiral flute design with a mirror finish enhances chip removal, lowers cutting resistance and heat, increases cutting speed, and reduces vibration and noise for stable operation. What it fits - Compatible with standard 3.175 mm (1/8 in) chucks on hand drills, drill presses, and CNC machines for PCB work. Practical uses - Drilling tiny vias and component holes in FR-4, copper-clad laminates, and similar PCB materials during electronics prototyping. - Micro drilling in acrylics, polyimide laminates, and other laminated plastics for model making or precision assemblies. Notes - Includes a protective box for organized storage and transport. - Ideal for technicians and hobbyists requiring reliable, repeatable 0.25 mm holes with good surface finish.