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This handy assortment of movement case rings is an easy way to replace missing, broken or damaged rings that hold the movement into the watch case. These are also great to have on hand when you are trying to retrofit mechanical to movements to quartz watch movements since there are so many variations to choose from. This assortment has many different outside shapes from round to rectangular. These are made to fit movement sizes 5 1/2L or 13.0mm oval to 11 1/2L or 25.6mm round. The movement case rings in this kit also have different heights to fit the thicker and thinner movements.