3 Watch Case Knives Jewelers Watchmakers Opener Tools This is a new set of 3 watch back case openers. Great for removing pressed on backs on all watches. These will open the most difficult watch backs. You receive: One case opener that measures approximately 5 1/4" x 3/8" (133.3 x 9.5 mm) One case opener that measures approximately 5 1/4" x 5/8" (133.3 x 16 mm) One case knife that measures approximately 6 1/4" (159 mm) long Newer versions of the item shown may be shipped, as a result, there may be a slight variation in color and design.