Pre-drill Screw Holes. When using a screw to attach a piece of wood to a surface pre-drilling the holes is a good idea.
Depending on how thick the wood is or how close you are to the edge, you can risk the board splitting from the pressure.
Having a board split on you during assembly is one of the most frustrating things about being a woodworker.
By pre-drilling the board with a hole slightly smaller than the screw will eliminate this issue.
One key thing to keep in mind is to use a countersink screw head.
The countersink feature allows the for a slightly larger opening at the top of the bit.
This will widen the pre-drilled hole to allow the screw head to be recessed in the board.
Failure to use a bit like this may lead to a cracked board even with pre-drilling.
This bit will also give you the option to plug the hole to hide the screw head.
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