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Countersinking is used to sink the head of a screw below the surface of the wood. The area can then be filled with putty, sanded and finished for a seamless look. Alternatively, the screw head can be left exposed and the countersink not filled, which provides easy access to the screw for removal. The best performing countersink bits for drilling into wood are high-speed steel bits ground from alloy steel with the edges hardened. The hardening is for long life. more »
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