IRWIN Lettered and Numbered Drill Bits information:
Letter and numbered drill bits were developed to make up the gaps in betwee... read more
How do I resharpen Speedbor flat bits?
Use a small file to sharpen the top of the cutting edge and inside the spur... read more
How do I resharpen Irwin auger bits?
First never sharpen the outside edges of the bit that cut--the spur and sid... read more