The size of screws will vary:
Rolex Oyster: https://www.amazon.com/gp/product/B00EVIIBLC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Rolex Jubilee: https://www.amazon.com/gp/product/B00EVII96Y/ref=ppx\_yo\_dt\_b\_search\_asin\_title?ie=UTF8&psc=1