High-quality material: Our lock cylinder is made of brass, including 1 lock cylinder, 8 keys, 2 mounting screws. The installer is provided with 2 keys. They can no longer be used after installation. Durable and strong, our door lock cylinder is strong and reliable, with emergency and danger functions. They are manufactured according to the latest safety standards, have drill protection and are of the highest qualityHigh security: Our lock cylinder has a variety of stable security functions. Lock cylinders and keys are made of solid pure copper and are resistant to prying, drilling, breakage, collision and fire.Quick installation: We provide you with suitable accessories so that you can quickly remove the old lock cylinder and replace it with our high-quality lock cylinderVersatility: Our door locks can be used indoors and outdoors and are suitable for all door types including wooden, metal and PVC doors. They can be used both as replacement locks and for new installationsSmooth use: When you insert the key and use it, the rotation is smooth and there is no jamming, so you can open and close the lock cylinder conveniently.