Dormer Pramet A125 8.00 mm x 310 mm HSS Straight Shank Extra Long Series Drill BS 328 is built for serious metalworking where reach and reliability matter. This 8 mm diameter drill bit pairs an extra-long 310 mm overall length with a solid straight shank, delivering precise alignment and uninterrupted chip evacuation when you’re drilling deep into thick workpieces or hard-to-reach cavities. Key features that make this drill stand out - 118-degree conventional point: A robust, easy-to-regrind tip that delivers predictable starts, reduces wandering, and maintains clean entry into steel, stainless steel, or aluminum. - Steam oxide finish: A purpose-built coating that minimizes material sticking to the cutting edge, promoting smoother cuts and improved chip flow for longer tool life. - Extra-long length: Specifically designed for deep-hole drilling and applications where reach is critical—no need to pause for re-clamping or secondary passes as you work through long sections. - Premium HSS material: High-speed steel engineered for durability and heat resistance across a range of metals, including steel, aluminum, and stainless steel, making it a versatile choice for mixed-material jobs. - Straight shank design: Ensures maximum rigidity and broad chuck compatibility, delivering steady performance in both manual and CNC drilling setups. Practical use cases and scenarios - Deep-hole drilling in automotive components, such as engine blocks or transmission housings, where access is tight and a standard drill won’t reach. - Fabrication and repair tasks involving thick metal plates or components with internal features that require a full-length bit to avoid rework. - Workshop projects that demand a single tool for drilling in steel, stainless steel, and aluminum without swapping bits mid-task. Why this drill matters in your toolbox - It’s not just about drilling a hole; it’s about keeping your workflow efficient. The extra-long reach reduces fixture changes and re-clamping, saving you time on labor-intensive builds and repairs. - The combination of a reliable 118° point and a steam oxide finish helps you maintain consistent hole quality across materials, so you can trust results from the first pass to the last. - With a robust HSS core, you can tackle everyday metalworking tasks with confidence, from simple hole-throughs to challenging blind-hole operations. Tips to maximize performance - Pair the drill with appropriate workholding and adequate lubrication or coolant to control heat and extend tool life. - Start at a modest feed rate to establish a true cutting path, then increase gradually as needed based on material hardness and hole depth. - Keep the drill perpendicular to the work surface for clean entry and to minimize drift, especially important with long-reach tools. - Regularly inspect the cutting edge; its re-grindability is a key advantage, helping you maintain sharpness without sacrificing accuracy.