General Contractor FAQ
I just used the large hole saw to drill through my door and it worked great. Now I have to use the small hole saw and the mandrel-pilot bit will not fit into it. What should I do?
The large hole saw has an adapter in it. When using this hole saw first, th... read more
What is the recommended bit speed for flat bits? I am sure that the speed varies by bit diameter and wood species
We have a recommended turning speed of 1500 - 2000 RPM on the IRWIN Speedbo... read more
What does the 'Bi-Metal' mean when referring to a utility blade?
The bi-metal terminology refers to how the utility blade is constructed. W... read more