Instant purchase OK No price reduction By adjusting the opener's screw to match the size of the watch, you can securely fix the back cover. Setting it on the base allows for stable work. This is a convenient item that allows you to replace batteries yourself. Useful for replacing batteries in waterproof watches! Tool for removing screw-type back covers of waterproof watches! The width of the upper claws can be adjusted up to 36mm in a two-point support state by turning the center knob. ▷Product Contents ・3-point support opener ・6 types of set claws, 18 in total (Small circle x 6, Medium circle x 3, Triangle x 3, Square x 3, Half-circle x 3)