How to Countersink a Screw
A countersinking screw is used so that the screw will sit flush with or below a surface. A pilot hole is required to guide the screw into the correct position and prevent the wood from splitting as the screw is tightened.
Excerpted from Do It Yourself Home Improvement
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Drill a Pilot Hole
Drill a pilot hole of the correct size to take the screw, and use this as a guide for the center of the countersink drill bit. Use a drill bit that is slightly narrower than the screw's gauge. Or, to drill a pilot hole for a wall plug, use a bit with the same diameter as the plug's gauge.
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