Set of 4 6 inch wire deadbolts, size 15cm x 2cm (width) x 1.6cm (depth), required groove depth 1.6cm, deadbolt protruding 1.4cm. Made of 304 stainless steel, brushed surface, reliable and durable. Designed for use in wooden door applications to secure the jambs of a range of double doors... Recessed into the door edge and completely hidden when the doors are in the closed position; Spring loaded lever lifts and lowers, easy to use and fits around the edges and back of the door; Supplied with a full set of installation screws (instructions not included, carpenter installation is preferred)