The Yale PM322 3 Lever Mortice Deadlock is designed for securing internal wooden doors with reliable performance. Featuring a distinctive grey lock case, it differs from other mortice locks in size and design—please consult the line drawing for exact dimensions. Available in polished brass or chrome finishes, this lock suits retail display packaging. Its 12.5mm deadbolt provides solid security, with locking possible from both sides. For enhanced protection against sawing attacks, consider upgrading to a 5 lever model with additional security features. Trusted worldwide, Yale offers durable quality for your internal door security needs.