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
What is the function of the hole in an auger bit?
The hole in the flute of the Installer Bits is to hook a wire through to ai... Read more
I recently purchased an old 13 piece set of IRWIN Solid Centre Stem Auger Bits from a used tools store for use in a hand-brace. The bits came in a wooden box with a swing-out lower drawer, and a black descriptive label on the inside lid. The box label says "1 set 20 1-2 quarters". What do these numbers mean? The bit numbers are 4, 5, 6, 7, 8, 10, 12, 14, and 16.
The 4, 5, 6 etc refers to the size in sixteenths. 4 is 4/16 or 1/4". 6 is 6... Read more