Quality Locking Pin Backs for Your Favorite Collectibles & Trading - No Tool Required. (Lot of 25, Silver) Secures insignia so you and your family can delight in the pieces you treasure for years to come. Safe alternative to the old screw/wrench locking mechanism; never bend or break another post again. Spring Loaded fastener for easier on-off action. Low profile for optimum comfort and fit. Great for use in display books, on lanyards, bags, vests and hats.