This took set is designed for safe removal and fitting of snap on watch back cases. One watchmaker's case press with non-scratching dies: *Eleven dies with diameters from 18mm to 50mm *Sturdy case iron base *Dimensions: 3" x 5" x 7" One watch case remover knife *Designed for removing snap-on watch backs *Handy for other watch repair tasks *High grade steel blade *Solid plastic handle, contoured for easy holding *Blade cover included One rubber dust blower *The dust blower can be used for removing any dust or debris from the watch interior. Die Sizes: 18 - 20 mm 21 - 23 mm 24 - 26 mm 28 - 30 mm 31 - 32 mm 33 - 34 mm 36 - 38 mm 40 - 42 mm 43 - 45 mm 48 - 50 mm