The size specification, example 5/16 x 1, these are the diameter of the pilot drill and the diameter of the colored
Make it Snappy Tools SD-3 Flat Bottom Counterbores
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Open Jun 25, 2026 - 11:18 AM
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Staff Answer
Jun 25, 2026 - 11:18 AM
We list all the sizes above for the Make it Snappy Tools SD-3 Flat Bottom Counterbores. Each flat countersink drill bit is sold individually or as a set of all 5. Sizing is indicated as: pilot hole x counter bore size for easy selection.
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Make it Snappy Tools SD-3 Flat Bottom Counterbores
Snappy Counterbores for a One-Step HoleCountersink bits are great when you're using wood screws with a cone-shaped head. However, if you're using lag screws, lag bolts, washer head screws, T-nuts & more, you need a countersunk hole with a flat bottom to properly seat the screw. That'...
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