L-g "openall" Waterproof Case Wrench | CWR-650.00 Ideal for opening Rolex Oyster cases Cast frame; steel rings Made in the USA 6 ring sizes are 18.5, 20.2, 22.5, 26.5, 28.3, and 29.5 millimeters Tempered rings will fit every existing size and will interlock as they are precision-made