Hammerite Metal Paint Smooth 2.5L Black Option:Dark Green The British Standard High Security The British Standard High Security Mortice Lock meets the new BS 3621:2007 standard preventing the main bolt being retracted by a credit card The inside handle can be deadlocked by an anti clockwise turn of the key from the inside so securing the lock against forced entry The bolt can be held in the withdrawn position (only) with the use of the snib feature This product is ideal for solid panelled doors An ergonomic internal locking handle which offers added security against forced entry Interior & Exterior Material: Zinc Alloy Fixings included 10 year guarantee and warranty