Perfectly concentric shape, wide flat spiral, precision machined from a special alloyed high carbon steel, inside hollow twist design, shank indentations for extension bar set screws, sharp finely honed cutting edges.

• 62 degree cutting angle reinforces cutting edge.
• Secondary relief angle removes material faster
• Oversized cutting head for easy removal from the workpiece
• Hardened tip for longer life
• Easy bit changes with Uni-Drive System TM