The Decor Square Pull Handle with Lock-Key in 35x1500mm size in Black (F501BLK) is a door hardware product that is typically used for residential or commercial doors. It is designed to be easily grasped and pulled open by a person, and the lock-key mechanism allows the door to be locked or unlocked from the outside using a key. This handle is made of high-quality materials and is finished in a sleek black color, making it suitable for a range of interior design styles. It is typically used on doors that open outward, and it is typically mounted on the face of the door. If you have any further questions about this product or its installation, it is best to consult the manufacturer or a qualified door hardware professional.