Meet the Dormer Pramet A125 3/8 Inch x 310 mm HSS ST Straight Shank Extra Long Series Drill BS 328 — a purpose-built twist drill crafted for deep-hole precision in metalworking. With its extended reach, this bit is ready for the toughest depths while maintaining true alignment in every cut.

• 118° conventional point — delivers a strong, self-centering start that resists wandering and remains easy to re-sharpen in the field.
• Steam oxide finish — helps reduce built-up edge and prevents workpiece material from sticking to the cutting edge, promoting smoother holes and longer edge life.
• Extra-long length (310 mm) — ideal for drilling very deep holes or accessing tight areas, reducing the need to swap to multiple tools for extended reach.
• Premium HSS material — high-speed steel built for durability and heat resistance, capable of drilling through steel, aluminum, and stainless steel with reliable performance.
• Straight shank — compatible with a wide range of drill chucks and machine tools, delivering stable, true alignment and minimal runout.
• BS 328 compliant — designed to meet professional standards for dependable, repeatable results in demanding applications.

Versatile in practice, this drill shines in a variety of scenarios:

• Fabrication and construction tasks that require deep drilling into steel frameworks, brackets, and gussets.
• Automotive and machinery assembly where long reach and consistent hole quality are crucial.
• Machining aluminum or stainless steel components where clean chip formation and edge life matter.

Practical tips for maximum performance:

• Choose the right speed: moderate speeds for steel, slightly higher for aluminum, and use suitable cutting fluid to extend tool life.
• Use measured pecking to clear chips when drilling deep holes, reducing heat buildup and improving hole finish.
• Inspect the tip regularly and re-sharpen as needed to maintain the precise 118° starting point for accurate starts.

The Dormer Pramet A125 3/8 in x 310 mm HSS Straight Shank Extra Long Series Drill BS 328 is a dependable choice for professionals who need depth, rigidity, and consistent performance in demanding drilling tasks. The brand’s logo image below underscores its heritage of quality in metalworking tools.