What Size Countersink bit do I need in 2020 - Best Guide
Countersink bits are available in various measurements like 40 mm, 35 mm, 20 mm, and 16.5 mm. For British Standard, almost 230 sizes ranging from 0.2 mm to 25 mm. Measure the screw head with the countersink to get a perfect hole. A simple method is to get a countersink one size larger than the screw size of the hole.
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