What this drill is: a single (1 piece) 1.1 mm spiral drill with a straight shaft. The shaft is made of cobalt steel for strength and wear resistance; the tip combines aluminum alloy and iron for effective cutting action. Why you need it: the precise 1.1 mm diameter is ideal when accuracy matters. The cobalt steel shaft gives long life and resistance to bending under load, while the spiral flutes remove chips efficiently. The mixed-material tip is designed to start and guide holes reliably in small, controlled drilling tasks. Key benefits Precision: exact 1.1 mm cutting diameter for repeatable, accurate holes. Durability: cobalt steel shaft increases service life and resists breakage. Effective cutting: aluminum-alloy and iron tip composition enhances initial penetration and consistent hole formation. Clean chip evacuation: spiral design reduces clogging for smoother drilling. Easy to fit: straight shaft is compatible with standard straight-shaft chucks. Best uses / practical scenarios 1. Electronics and PCB work — drilling 1.1 mm holes for component leads or mounting points where precision and minimal splintering are required. 2. Model making and hobby projects — creating clean, repeatable holes in plastics, soft metals, and wood for assemblies and fasteners. 3. Small repair jobs — precision drilling for jewelry, clocks, or small mechanical parts that require controlled hole sizes. Notes for use Supplied as one 1.1 mm drill bit with a straight shaft. Use appropriate drilling speeds and minimal lateral force to maximize life and accuracy. Inspect and replace if tip wear or shaft damage is evident to maintain consistent hole quality. This 1.1 mm cobalt steel spiral drill delivers precision, durability, and reliable performance for a range of small-diameter drilling tasks.