1The watch pins is used for connecting the watch and the strap, which is replaceable, super convenient. 2It is divided into 20 grids, each grid is about 15, and a box is about 300 in total, can be used for a long time. 3There are 3 different sizes 1.3-1.78mm watch pins to meet different watch sizes. 4They are a must have for watchmakers and jewelers who work on watch bands and watch clasps. 5Made of high-quality metal, sturdy and durable, can stand long-term use if it is well cared.