10 Pcs Pin Keepers, Pin Safe Locks, Pin Backs, Clasp Locking Pin Keeper Backs, Brooch Pin Locking Pin Backs with Wrench Tools Feature Each pin keeper is approximately 5 mm in diameter and 6 mm in height. These pin backs are made of nickel-plated copper, durable and rust-resistant. Smooth surface, sturdy construction, securely locks pins in place. Prevents pins from falling off; serves as a replacement for damaged screw or wrench locking mechanisms. Keeps brooches, medals, and other items firmly in place. Includes pre-installed small screws—no loose parts to manage. How to use: Insert the black screw into the center hole. Use the included wrench to partially tighten the screw to secure it. Align the two outer prongs with small holes on the brooch or medal. Gradually tighten the black screw with the wrench until fully secured. Item Type: Pin Keepers Material: Brass Color: Silver Size: As shown in product images Quantity: 10 Sets Note: Size is measured manually; slight variation of up to 3 mm is normal. Screen settings may cause color appearance to differ slightly from actual item. Package includes: 10 Sets x Pin Safe Locks