Product description Key benefits — why you need this drill set Precision small-diameter drilling: ideal when accuracy and clean, round holes matter for tiny parts. Durable, long-lasting cutting performance: made from HSS (High Speed Steel) for improved wear resistance and heat tolerance compared with plain carbon drills. Efficient chip evacuation and smooth cutting: spiral flute design reduces clogging and helps produce cleaner holes in manual drilling operations. Stable mounting and control: straight shaft for secure placement in manual holders and hand drills, giving better tactile feedback and control. What this product is HSS manual spiral drill with a straight shaft designed for hand/manual use. Drill diameters: 1.1 / 1.2 / 1.3 / 1.4 / 1.5 / 1.6 / 1.7 / 1.8 / 1.9 / 1.95 / 2.0 mm (10 pieces). There is also a size of 1.55 mm. Material: High Speed Steel (HSS). Function: manual spiral drill bits for controlled, low‑speed drilling. Practical attributes and performance Function: Spiral flutes for continuous chip removal and consistent cut while drilling by hand. Compatibility: Straight shaft allows mounting in manual chucks, pin vises, or hand drill holders that accept straight-shaft bits. Size coverage: Multiple fine increments for delicate work, repairs, and fitting precise clearances. Performance: Best used at lower speeds appropriate for hand drilling to maintain bit life and hole quality. Typical applications (real-world use cases) Electronics and PCBs: Drilling accurate vias and component holes in circuit boards and fiberglass laminates. Hobby and scale model building: Creating clean holes in plastics, resin, thin metal sheets, and wood for pins, rivets, and assembly points. Jewelry, watchmaking and small repairs: Precision work where hole diameter tolerance and finish matter. Quick specifications Type: Manual spiral drill bit set Shaft: Straight Material: HSS (High Speed Steel) Diameters included: 1.1 / 1.2 / 1.3 / 1.4 / 1.5 / 1.6 / 1.7 / 1.8 / 1.9 / 1.95 / 2.0 mm (10 pieces). Also includes 1.55 mm. How it solves common problems Replaces chipped or blunt small drills with HSS replacements that stay sharper longer. Spiral flutes cut cleaner holes and reduce the risk of splitting or cracking delicate materials. Straight shaft and precise sizes let you mount and center bits securely for repeatable, accurate holes. Ordering notes Designed for manual use; select appropriate hand holder and follow safe low‑speed drilling practice for best results.