1. Set Contents: Set of 12 safety pins, 6 sizes: 2.4 inches (6 cm), 3.5 inches (9 cm), 4.7 inches (12 cm), 5.9 inches (15 cm), 6.7 inches (17 cm), 7.9 2. Material: Aluminum alloy (prevent fraying). Made of durable metal, sturdy, strong, safe, and not easy to bend. 3. Convenient: Easy and convenient to use locking marker. Attach the number rings to the increment and decrease position. It is easy to open and close, and you can check it while weaving it smoothly. Perfect accessory for knitting, marking lines, crochet and craft projects 4. Prevents fraying: Keep the knitting in place so that it does not fray. It is convenient for processing collars, shoulders, cuffs, etc. when weaving sweaters. 5. Multi-purpose: The number of steps is a lock type marker that does not slip from the knit, so you can use it safely, and if you put the number rings on the increments and decreased position, you can check it while weaving it smoothly. Useful for knitting marking, crochet, weaving, scrapbooking, DIY, crafting, crafting, etc.