Meet the Dormer Pramet A125 11/32 Inch x 250 mm HSS Straight Shank Extra Long Series Drill BS 328—a purpose-built tool designed to tackle deep-hole projects with precision and reliability. Built for professional workshops and serious hobbyists alike, this drill bit blends robust performance with practical versatility.

• 118-degree conventional point: A strong, self-starting tip that resists wandering and remains easy to re-grind when sharpening is needed, helping you extend tool life and maintain accuracy over time.
• Steam oxide finish: A low-friction coating that minimizes metal-to-metal adhesion on the cutting edge, reducing built-up edge and improving chip evacuation for smoother drilling.
• Extra long length series: Specifically designed for drilling very deep holes and reaching into recessed or hard-to-access areas without sacrificing rigidity or control.
• Premium HSS material: High-speed steel offers dependable performance across a range of metals, including steel, aluminium, and stainless steel, making this drill a versatile workhorse for mixed-material fabrication.
• Straight shank: Compatible with most standard chucks and collets, delivering straightforward setup and solid grip for consistent drilling accuracy.
• BS 328 designation: A recognized standard that confirms precise dimensions and reliable machining suitability for professional use.

Why choose this drill bit? When deep drilling is required, you don’t want to compromise on reach or rigidity. The A125 Extra Long Series delivers extended reach without sacrificing cutting efficiency, reducing the need to switch tools mid-project. It’s ideal for tasks such as creating deep clearance holes in thick steel plates, penetrating multiple layers of aluminum extrusions, or drilling deep channels in stainless components where traditional-length bits fall short.

Who benefits most? Machinists, maintenance technicians, fabricators, and metalworking enthusiasts who routinely push drill bits to their limits. This drill shines in production environments where consistent performance, predictable re-sharpening, and durability matter more than quick, single-use results.

Practical tips for best results: match speed and feed to the material—moderate speeds for steel and stainless steel, slightly higher for aluminum—while using appropriate coolant or lubrication to manage heat. Let the bit do the work: avoid excessive force on entry and maintain steady, perpendicular alignment to the workpiece for clean holes and extended tool life.