16 Pocket Watch Clock Chime Keys Winding Tools. This is a new set of 2 clock keys. These are used to wind clock mainsprings. You receive: One size 00 clock key with a 2.00 mm hole. One size 0 clock key with a 2.25 mm hole 14 Watch Winding Keys. This is a new set of 14 watch keys. These keys are used for winding watches. You receive: One 00 size watch winding key. One 0 size watch winding key. One 1 size watch winding key. One 2 size watch winding key. One 3 size watch winding key. One 4 size watch winding key. One 5 size watch winding key. One 6 size watch winding key. One 7 size watch winding key. One 8 size watch winding key. One 9 size watch winding key. One 10 size watch winding key. One 11 size watch winding key. One 12 size watch winding key. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.