Adjustable Watch Case Opening Wrench for Waterproof Watches - 5 Stud Sets - Wooden Box One wrench opens multiple watch brands & sizes safely; save money replacing batteries yourself 3 stud design gives better grip, less risk of slipping & scratching watch Top studs adjust width by rotating wheel, lower stud moves up/down by turning handle; range 14-40mm 5 sets 3-piece studs with tips: 1.6mm round (2 sets), 6.4mm half-moon, 1.4mm square, 2.6mm triangle Heavy-duty steel handle & frame with mirror-chrome finish, textured handle grip, wooden storage box