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.
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DK - Do It Yourself Home Improvement © 2009 Dorling Kindersley Limited
Before inserting a screw with a countersunk head, use a countersink drill bit to enlarge the pilot hole's opening. The bit widens toward its top, so drill a shallow hole for a small screw head, and a deeper hole for a larger one.
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