Smith and Locke Code entry door lock Brand new but sat in loft for a few years. Box may have marks but contents brand new. Sent by Royal Mail Tracked Delivery. The Code Lock Mechanical by Smith and Locke is a modern, dual-function mortice latch suitable for a variety of doors including bathroom, cellar, barn, garage, and fire doors. Made from stainless steel and aluminium, this grey-coloured lock comes with instructions and hardware for easy installation. With a keyless feature and adjustable backset, this UK-manufactured unit offers a convenient and secure solution for your home or business.