10Pcs Pin Keepers, Pin Safe Locks, Pin Backs, Clasp Locking Pin Keeper Backs, Brooch Pin Locking Pin Backs with Wrench Tools Features: - Each pin keeper is approximately 5 mm in diameter and 6 mm in height. - These bulk pin backs are made of nickel-plated copper, durable and rust-resistant. - Smooth surface design provides a secure lock for your pins, helping prevent them from falling off. - Ideal replacement for damaged or missing screw mechanisms. - Keeps accessories securely in place during wear. - Pre-assembled small screw included—no loose parts to handle. How to Use: Insert the black screw into the center hole. Use the included wrench to tighten the screw halfway to secure it in place. Attach the pin keeper to the brooch, medal, or accessory by inserting the pin through a small hole on either end. Continue tightening the screw with the wrench until firmly secured. Item Type: Pin Keepers Material: Brass (nickel-plated) Color: Silver Size: Approx. 5 mm diameter, 6 mm height (see photos for details) Quantity: 10 Sets Note: - Size measurements are manually taken and may vary by 0–3 mm, which is considered normal. - Due to differences in monitor displays, the actual item color may vary slightly from the image. Package Includes: 10 Sets x Pin Safe Locks (including wrench tools)