The Dormer Pramet A125 1/4 Inch x 400 mm HSS ST Straight Shank Extra Long Series Drill is purpose-built for serious deep-hole work. This long-reach drill bit delivers reliable precision when you need to pierce through metal with minimal wandering, delivering consistent starts and clean holes in demanding environments. Built for compatibility with a wide range of machines, it’s a versatile choice for workshops that routinely tackle extended holes and hard-to-reach workpieces. Key features that set this drill apart - 118-degree conventional point: Promotes strong, self-centering starts and is easy to re-grind when you need a fresh edge, so you get long-lasting performance from fewer tool changes. - Steam oxide finish: Reduces friction and resists gumming by workpiece material, helping chips evacuate more smoothly and extending edge life in tougher materials. - Extra long length series: Specifically designed for drilling very deep holes and situations where reach matters, making it ideal for milling, backhand drilling, or workpieces with limited access. - Premium HSS material: High-speed steel delivers dependable performance across a broad spectrum of materials, including steel, aluminum, and stainless steel, while maintaining solid toughness and wear resistance. - Straight shank for broad compatibility: The ST straight shank ensures secure clamping in standard chucks and holders, providing stable guidance and reduced runout during heavy-duty drilling. What makes this drill a smart choice - Practical use cases: Deep-hole automotive repairs, fabrication projects with thick plates, maintenance tasks on machinery where access is restricted, and any application requiring extended reach without sacrificing rigidity. - Material versatility: While optimized for steel, it handles aluminum and stainless steel with consistent chip evacuation and edge retention, helping you minimize tool changes and maximize throughput. - Performance in real-world workflows: The combination of a durable HSS body, a precise 118° tip, and a steam oxide finish translates to fewer interruptions, smoother drilling, and cleaner holes—especially when working with clean, ferrous and non-ferrous metals. Tips for best results - Set appropriate speeds and feeds: Start at conservative RPM and increase gradually to match material type and hole depth. For deeper holes, peck drilling in short intervals can help clear chips and prevent binding. - Use cutting fluid or light lubrication on tougher metals to extend edge life and improve finish. - Align and secure: Ensure the straight shank is properly clamped to minimize runout, which helps achieve straighter holes and reduces tool wear. - Inspect and re-sharpen: The 118-degree point holds its geometry well, but when you notice wandering or chipped edges, a controlled re-grind will restore performance and extend tool life. Designed for professionals who demand dependable reach and consistent hole quality, this drill is a strategic addition to any metalworking set. Whether you’re outfitting a CNC mill, a drill press, or a handheld unit, the Dormer Pramet A125 1/4" x 400 mm HSS Straight Shank Extra Long Series Drill combines long-reach capability with robust material compatibility to keep your projects moving.