Last updated: July 12, 2026
WhatDrillBit is a free reference tool provided as a helpful guide. By using the site, you agree to these terms.
Guidance, not a guarantee
The pilot-hole sizes and information here are general guidance based on cross-checked sources and a split-safe calibration. Real results depend on things we can't see — the wood species and its moisture, the specific screw, the temperature, and how close to an edge you're driving — so sizes aren't guaranteed for every situation. Use your own judgment, and when in doubt, start one size smaller and test on a scrap piece first.
Provided "as is"
The tool and content are provided "as is," without warranties of any kind, express or implied. We don't warrant that the information is complete, accurate for your specific materials, or fit for a particular purpose. To the extent permitted by law, WhatDrillBit is not liable for any loss, damage, or split boards arising from use of the site. You are responsible for your own tools, materials, and safety.
Structural and load-bearing work
For structural, load-bearing, or safety-critical work — framing, decks, anything that holds weight or people — don't rely on a general reference. Follow the fastener manufacturer's specifications and your local building codes, and consult a qualified professional.
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Changes
We may update these terms from time to time. Continuing to use the site means you accept the current version.