SS - 304 Solid Mortise handle A solid mortice handle is a type of door handle that is made from a single piece of metal, usually stainless steel, and is designed to fit with a mortise lock. A mortise lock is a locking mechanism that is installed inside the door and requires a key to operate. Solid mortice handles are durable, corrosion-resistant, and have a sleek appearance. They are commonly used in both residential and commercial settings.