12 Chrome plated steel capstan screws, a little over 1-1/8" long with a 5/16" diameter head.  Hexagonal adjustment section (easier than square area).

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I've been a tech 30+ years and have restored/restrung many pianos.  If you have questions before or after your purchase I'm glad to help. My contact info is included with each purchase and you can also reach me through eBay.