The Dormer Pramet A125 3/8 Inch x 250 mm HSS ST Straight Shank Extra Long Series Drill BS 328 is built for deep-hole drilling without compromising precision or durability. Designed for professional workshops and serious DIY setups alike, this drill bit delivers dependable starts, steady cutting, and exceptional reach in a single, reliable tool.

• 118-degree conventional point: A robust, self-centering tip that begins cuts cleanly and maintains stability, making it easy to re-sharpen when needed.
• Steam oxide finish: A friction-reducing coating that helps minimize workpiece sticking to the cutting edge, promoting smoother drilling and improved chip evacuation.
• Extra long length series: Specifically chosen for drilling very deep holes and reaching into recessed areas where standard bits fall short—ideal for fabrication, automotive, and metalworking projects.
• Premium HSS material: High-speed steel offers reliable performance across a range of metals, including mild steel, aluminum, and stainless steel, with good wear resistance and heat tolerance.
• Straight shank: Designed to fit standard drill chucks with solid, concentric grip for accurate drilling and reduced runout on machines ranging from benchtop drills to CNC setups.
• Versatile, ready-for-work design: A true all-rounder for applications requiring depth, reach, and consistent hole quality in metalworking, fabrication, and maintenance tasks.

Who needs this drill bit? Anyone tackling deep-hole tasks in metal: automotive technicians drilling into engine blocks or frames, fabricators creating through-holes in thick plates, or workshop DIYers working on projects that demand extended reach without swapping to multiple shorter bits. The A125 3/8" x 250 mm combines depth capability with dependable cutting performance, making it a practical upgrade over standard-length bits when your workpiece requires reach and precision in one tool.

Practical tips for best results:

• Use moderate feed rates and steady pecking cycles to clear chips as you drill deeper, which helps maintain cutting efficiency and prolongs edge life.
• Apply a compatible cutting fluid or light lubrication to reduce heat buildup, especially when drilling stainless steel or other harder materials.
• Ensure a secure workpiece clamping setup to prevent deflection and maintain straight, true holes on long reach cuts.
• Keep the point sharp—this bit is designed for easy re-sharpening, so schedule routine maintenance to preserve performance over time.

With the Dormer Pramet A125, you’re choosing a trusted HSS drill bit that pairs depth capability with dependable control. It’s the go-to choice when a 3/8" diameter, 250 mm length, straight-shank drill is required to complete deep, precise holes across metals and alloys—delivering consistent results every time.