[Heavy duty stainless steel] The insert frame bolt is made of high-quality stainless steel, which is sturdy and durable, not easy to break, waterproof and rustproof, and has a refined surface finish. It has excellent wear resistance and corrosion resistance, with good strength and hardness, making your door safer. <p> <p> [High security] The thickened panel and robust stainless steel bolt design make the door lock safety frame bolt lock more durable and can perfectly replace traditional door locks. Safety locks are installed in pairs near the top and bottom of the door to maximize the safety of the door. They are ideal for adding additional security to doors and windows. <p> <p> [Door lock] You will receive 4 safety door lock bolts, lock hole covers, reception plates, fixing screws, and corresponding keys. With these perfect combinations, you can install and use them at any time without purchasing additional accessories, saving you time and money. <p> <p> [Smooth unlocking] The core safety bolt adopts a solid stainless steel lock tube, which is not easy to deform, and is firm and durable. The precise keyhole design allows you to unlock the lock smoothly and is not easy to get stuck during use. <p> <p> [Wide use] The key of a plug lock is universal, and two keys can open two locks with each other. Lock bolts are mainly used for dual fire doors, pipe doors, circuit doors, and circuit doors in homes or factories.