Countersink Bit vs Counterbore Bit: Which Prepares a Screw Hole Correctly?
A countersink bit and a counterbore bit both change the shape of a drilled hole so a screw head fits better. They do different jobs, though: a countersink makes a cone-shaped recess for a flat-head screw, while a counterbore makes a flat-bottomed, wider recess for a cylindrical head or plug. Pick the wrong one and … Read more