Watch Repair Tool Back Opener Large Wrench Waterproof Screw Case Easily adjustable for various case dimensions (18mm to 60mm) Clamps includes: 3 x Flat, 3 x Square, 3 x Triangle, 9 x Round Dimensions: Approx. 16.5 x 7 x 1cm (L*W*H) 3 adjustable jaws Key for waterproof watch-cases, with 4 sets of clamps (round, flat, square, triangle)