["Feature\nThese bulk pin backs are made of nickel-plated copper, durable and anti-rust.\nSmooth surface, sturdy and lock your pins firmly, \nwithout worrying they will fall off and provide you replacement to the torn screw or wrench locking mechanism; \nKeep your objects in place during important moments.\nDon'for t lose any of your pins, keep them secure by locking them in place with this handy set.\nSmall screw pre set in for you. No more small parts to mess with.\n\nHow to use: \nPut the black screw into the middle hole, \nthen use a small wrench to screw half of the black screw to ensure that the fixed, \nfixed into the brooch or medal needs to be fixed to the other two ends of any small hole,\n then use a wrench to tighten the black screw gradually, to ensure that the fixed.\n\nItem Type :Pin Keepers\nMaterial：Brass\nColor:Silver,\nType：A/B(Optional)\nSize:\nA Small 6x5mm\nB Large 6x9mm\nMore detailed,please see photo.\nQuantity:10 Sets.\n\nNote:\nSize for manual measurement, there may be a 0 to 3mm error, belongs to the normal phenomenon.\nAnd due to the difference between different monitors, the picture may not reflect the actual color of the item.\nThank you!\n\nPackage includes:\n10 Sets x Pin Safe Locks."]