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Fuller Taper Point Hex Shank Drills are designed to pre-drill holes in wood to accept the thread and shank portion of standard wood screws. Quick-Change Taper Point Hex shank drills, when used with the Fuller Quick Release Chuck Adapter, make switching out drill sizes quick and simple.
The Hex Shanks can be used in conjunction with Fuller countersinks and counterbores, and are made from industrial quality US High Speed Steel. Has 1/4" Hex Power Groove Quick Release Shank.
The clearance hole though the wood being fastened should be as close to the diameter of the shank of the wood screw as possible. If the clearance hole is too small, the shank of the screw could bind in the hole causing the screw to tighten before reaching its maximum pulling force in the wood being attached to or even breaking. If the clearance hole is bigger than the shanks of the screw, the wood could move which could cause squeaks, wear and leaks. Space around the screw could also collect moisture causing premature corrosion or rotting depending in the materials involved.
The pilot diameter for the threaded portion of the screw is even more important. It determines how well the screw holds its grip on the wood it is being fastened to and how long it will maintain that grip. Generally, the diameter of the drill used to pre-drill for the threaded portion of a wood screw should be the same size as the root diameter of the screw.