same number and configuration of openings therein to align with the openings in the back plate 9 to permit attachment between the l shaped member 11 and back plate 9 and to a door surface as will be described hereinafter the l shaped member 11 has a leg 25 which forms in part a guide for dead bolt action of the inventive device the back plate 9 includes a plurality of spaced apart openings 27 which facilitate attachment of a combination dial lock assembly thereto the back plate 9 also includes an open ended slot 29 which is designed to receive the shaft of the combination dial lock assembly the open ended slot 29 permits the shaft of the combination dial lock assembly to slide into the back plate 9 to facilitate easy removal or installation of the combination dial lock assembly with the inventive dead bolt assembly the back plate 9 l shaped member 11 bottom member 13 and cover 15 may be formed as a one piece integral structure such as a cast component in this manner manufacturing is simplified and production costs are lowered it should be understood that the combination dial lock assembly is not considered an aspect of the present invention these types of lock assemblies are well known in the art.