ISA STEM - High-Quality STEM Learning Kits for Kids | Educational Science Toys for Classroom & Homeschooling | Perfect for Ages 5-12 | Hands-on Experiments & Creative Projects

These genuine ISA replacement watch stems are a must have for any watchmaker. A definite life saver, these watch stems are sold individually and come in the most common sizes of today so you will always have the right size stem on hand. Perfect for times when the current watch stem has been discontinued, cut too short, or broken off inside the movement. Simply select the stem from the drop down menu above.