USA Made. Designed to open Rolex Oyster cases. The six tempered rings will fit every existing size and because they are precision-made to interlock, they will not slip. The sturdy cast frame into your bench vise and the small bar gives you the torque needed for stubborn case backs. An optional base is available. The built in adjustable case holder fits all size watches. The L-G "Openall" can also be used in conjunction with the L-G Master case opener. Ring sizes are 18.5, 20.2, 22.5, 26.5, 28.3, 29.5mm.