The Dormer Pramet A125 5.00 mm x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is purpose-built for metalworkers who demand reach without sacrificing precision. When deep bores or recessed work come into play, this drill bit delivers reliable performance from the first cut to the final exit. Key features that matter in real work: - 118° conventional point: A robust, self-centering tip that bites cleanly into steel, aluminum, and stainless steel, while remaining easy to re-sharpen in busy shops. - Steam oxide finish: A barrier that reduces workpiece material from sticking to the cutting edge, helping to extend tool life and maintain a consistent chip flow. - Extra-long 310 mm length: Purposefully designed for drilling very deep holes or reaching awkward workpieces where standard bits can’t reach. Ideal for fabrications, automotive components, and machinery housings where depth is non-negotiable. - Premium HSS material: High-speed steel offers a versatile drill for a broad range of metals, providing dependable performance on steel, aluminum, and stainless steel without frequent tool changes. - Straight shank: Simple, stable chuck engagement for precise, repeatable drilling in standard drilling machines and mills. Who benefits most - Machinists and fabrication shops tackling long-hole drilling tasks. - Maintenance teams performing deep-thread or through-hole work in equipment housings. - Manufacturers seeking to minimize tool changes by using a single, versatile 5.0 mm drill for multiple metals. Practical usage tips - For stainless steel or alloys, use a light cutting fluid and moderate speeds to maintain edge life and reduce heat buildup. - Secure the bit firmly in a compatible drill chuck; avoid wobble to preserve the tips’ 118° geometry. - Regularly inspect the edge and re-sharpen as needed to maintain an efficient cutting action through long bore operations. This drill BS 328 variant is designed to fit standard machines and deliver consistent results across multiple materials, making it a dependable staple in any shop’s deep-hole toolkit.