Get METRIC Studs if you DON'T have a Gibson Guitar.

Imperial Thumbwheels

Thumbwheels (Imperial Threads)

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$2.99
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$2.99
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Tune-o-Matic bridge Thumbwheels (Imperial Threads - Sold as a pair)

METRIC 4mm thumbwheels can be found here : https://faberusa.com/product-category/for-new-builds/thumb-wheels-for-new-builds/thumb-wheels-for-bswkit-4mm-bridge-posts/