Countersink

When inserting flat-headed wood screws into hardwoods, a countersink should be used to create a tapered recess in the wood to accommodate the head of the screw. By using a countersink after drilling the hole, you reduce the chance of the wood splitting by driving the head into the wood. In this glossary article, learn about how to use a countersink.

Source: http://woodworking.about.com/od/glossarytermsad/g/Countersink.htm

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