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About Counterbores
Create flat-bottomed holes, so your screw heads sit flush, recessed, or slightly raised.
Oversized Counterbores
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Pilot | Shank | Uncoated | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
For Screw Size | Body Dia., mm | Dia., mm | Lg. | Overall Lg. | Dia. | Type | No. of Flutes | Mfr. | Each | |||
0.5 mm Oversize | ||||||||||||
| M20 | 30.5 | 20.5 | 0.750" | 8 1/8" | 7/8" | Round | 4 | Alvord-Polk Tool | 2740A26 | 0000000 | ||
EachIn stock Select a compatible file type: Parasolid | ||||||||||||

























