Irwin micro-dial expansive wood bit. No 22. Large, bores 7/8" to 3"
1. measure exact hole size wanted.
2. loosen screw on back of dial to set large size cutter assembled in bit.
3. turn dial to hole size you want to bore.
4. make sure proper mark on cutter is in line with mark on body of bit.
5. tighten dial screw securely and you're set to go.
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Canada