British Standard Lever Mortice Sashlocks in Stainless Steel finish with a 76mm case, Stainless Steel forend and silver box strike, supplied with 2 keys. Patented twist, reversible latch handing changed in seconds. 10 year manufacturer's guarantee. CE marked EN 12209. Tested BS 3621:2004. Suitable for inward / outward-opening fire doors. Ideal for retro-fit applications. Specifications: Backset 3" / 76mm. W x D x H: 25 x 76 x 165mm. BS 3621: 2007. For internal and external application.