Watch Repair Tool Kit, Set of Back Opener Wrench and Large Watch Case Movement Holder for Waterproof Watch, Change Battery Yourself This tool is ideal device fo replacing batteries for any other watch repair Easily adjustable for various case dimensions (18mm to 60mm) Dimensions: Approx. 15 x 5 x 3 cm (L*W*H) / 5.9 x 1.97 x 1.18 inch Key for waterproof watch-cases, with 4 sets of clamps (round, flat, square, triangle) Fully adjustable via the wheels and Holds watch in 3 positions