[Good Quality]: The lock core is made of brass, with good hardness and toughness, strong anti-theft, with anti-drilling protection, and the highest quality. The matte finish lock cylinder is strong and not easily damaged. [Easy Installation]: This lock cylinder can be assembled quickly and easily with a screwdriver ( cruciform head). Cylinder locks can also prevent lock picking and tampering. The cylinder with button has a built-in emergency and safety function. It can be locked from both sides. More convenience. [Security key]: This lock cylinder is equipped with 2 keys A and 6 keys B. Insert key B and turn it 360 counterclockwise, the A key will be invalid, which can ensure safety after decoration. [Door lock cylinder in the shape of a key]: Total length 90 mm, double lock cylinder system with 8-pin elements, reversible key system with horizontal key entry, opened and locked on both sides with a key. [General Application]: Our door locks can be used in indoor and outdoor areas, suitable for all types of doors, including wooden doors, metal doors and PVC doors. They can be used as replacement locks or for new installations. Entrance door or bathroom door, double door or single door, sliding door. You have just moved into a new apartment and you are worried that the old one will owner hasn't given you all the keys? You haven't been able to find your emergency key for your front door for a long time? Many know these situations all too well. Your safety is in your hands Small investment in your home and you can already enjoy the pleasant feeling of being safe in your home. Specification Material: Brass Lockable on both sides Length: 9cm Package includes 1* professional cylinder lock 6 * B keys 2 * A keys Note 1. Please allow 1-2mm measurement deviation due to manual measurement. 2. Due to the difference between different monitors, the color shown in the picture may be slightly different from the color of the actual item.