Dormer Pramet A170 55/64 Inch HSS ST STRAIGHT SHANK JOBBER DRILL, 1/2IN SHANK

The Dormer Pramet A170 55/64" HSS Straight Shank Jobber Drill is a heavy‑duty drill bit designed for large‑diameter holes in metalworking. With a 55/64" diameter and a 1/2" straight shank, it pairs a robust cutting edge with broad compatibility for standard hand‑held drills and machine chucks, making it a reliable choice for professionals and serious hobbyists drilling steel, aluminum, and stainless steel.

Crafted from premium high‑speed steel, this drill bit balances toughness and wear resistance to handle a variety of materials. The 118° conventional point delivers a strong starting bite and remains easy to re‑grind for extended life. A steam‑oxide finish prevents workpiece material from sticking to the cutting edge, promoting smoother cuts, better chip flow, and longer edge life.

• 118° Conventional Point: Provides a strong starting bite and is easy to re‑grind, helping you achieve precise holes with fewer passes.
• Steam‑Oxide Finish: Prevents workpiece material from sticking to the edge, improving chip flow and reducing downtime.
• 1/2" Parallel Shank: Fits standard chucks and tool holders, enabling quick setup and secure use with large‑diameter drills in both handheld and machine applications.

This drill bit delivers consistent, reliable performance across a range of metals, enhancing workflow by reducing rework and tool downtime. The combination of premium HSS, a dependable point geometry, and a corrosion‑resistant finish ensures you can rely on clean holes and long service life, whether you’re in a shop or on the job site.