10Pcs Brooch Pin Safe Keepers Pin Locks Pin Backs Clasp Locking Pin Keeper Backs Locking Pin Backs With Wrench Tools Feature These bulk pin backs are made of nickel-plated copper, durable and anti-rust. Smooth surface, sturdy and lock your pins firmly, without worrying they will fall off and provide you replacement to the torn screw or wrench locking mechanism; Keep your objects in place during important moments. Don"t lose any of your pins, keep them secure by locking them in place with this handy set. Small screw pre set in for you. No more small parts to mess with. How to use: Put the black screw into the middle hole, then use a small wrench to screw half of the black screw to ensure that the fixed, fixed into the brooch or medal needs to be fixed to the other two ends of any small hole, then use a wrench to tighten the black screw gradually, to ensure that the fixed. Item Type :Pin Keepers Material:Brass Color:Silver, Type:A/B(Optional) Size: A Large 6x9mm B Small 6x5mm More detailed,please see photo. Quantity:10 Sets. Note: Size for manual measurement, there may be a 0 to 3mm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package includes: 10 Sets x Pin Safe Locks. About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact us During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.