Key specifications Cutting edge diameter: 0.25 mm Cutting edge length: 6.4 mm (0.25") Shank diameter: 3.175 mm (1/8") Total length: 38 mm (1-1/2") Finish: titanium coating Type: with positioning ring Package: 10 PCB drill bits in a protective box Why this product helps Precision drilling for very small holes: 0.25 mm cutting diameter and a short cutting length enable accurate, repeatable holes needed for PCBs and fine-detail work. Long life and reliable performance: solid carbide construction delivers high hardness, strength, wear resistance and thermal stability so the bits resist breakage and keep cutting consistently over many uses. Cleaner cuts, less overheating: titanium-coated surfaces reduce friction, improve surface smoothness, and help control heat build-up for better hole quality. Better chip evacuation and stability: spiral flute design clears chips efficiently, lowers cutting resistance and vibration, and maintains a stable drilling process. Accurate placement: the positioning ring helps set depth/position quickly and consistently when using fixtures or handheld rotary tools. Key features Solid carbide body: high strength and wear resistance for longer service life and stable cutting performance. Titanium coating: lowers friction and sticking, improves surface finish and machining accuracy. Spiral flute with mirror finish: effective chip removal, reduced cutting heat, lower noise and vibration. Positioning ring: assists with repeatable depth/position control during setup and drilling. Standard 3.175 mm (1/8") shank: compatible with common collets and rotary tool holders. Function and compatibility Designed primarily as PCB drill bits for printed circuit board work and other precision micro-drilling tasks. Shank fits standard 1/8" collets used in many rotary tools, micro motors and small drill presses. Suitable for drilling small holes in FR-4, fiberglass, thin metals, plastics and similar substrates used in electronics and hobby applications. Typical use scenarios PCB prototyping and repair: drilling plated or unplated through-holes for component leads, vias and repair patches. Electronics assembly and lab work: precise hole making for sensor projects, connectors and custom boards. Hobbies and fine fabrication: model making, watch/jewelry work and small-scale metal or plastic drilling where a 0.25 mm hole and tight tolerances are required. Package contents 10 x 0.25 mm solid carbide PCB drill bits with positioning ring, titanium coated, supplied in a protective storage box.