by 
Jimmyz101
ANSWERS: 1
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A pilot hole is a holed drilled as a guide for the nail or screw used in the procedure. It is usually smaller than the nail or screw used for the procedure. What it does is keep the wood from splitting, along with making it easier to drive in the screw or nail. The way I define a clearance hole is this; It is a hole which allows you to gain access to a particular spot. If you have a process where you need to get to an obstructed screw in order to take something apart, or to put it together you would need to put in a clearance hole. Some pocket doors, and some side mount glides have clearance holes.
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