The C & E Marshall Co Bracelet Mainspring Winders Set of 8 with Case is a collection of specialized tools designed for winding mainsprings in bracelets. This set from the reputable brand Marshall includes 8 different mainspring winders, perfect for professionals or individuals looking to repair or create their own jewelry pieces. The convenient case keeps the tools organized and easily accessible, making it a practical addition to any watchmaker's or jeweler's workshop.