This Prime-Line E 2199 Mortise Lock is constructed with a corrosion-resistant stainless steel housing and stainless steel faceplate. The mortise lock set features a round-end face plate that serves as an adjustment feature for the hook's distance of projection. The keyway of the replacement mortise lock rests at a 45 degree position when the hook is fully extended in the locked position. The mounting holes of the sliding door latch are spaced apart at 3-11/16 inch on center. The patio door latch fits on W and F manufactured handles. For all dimensional information please refer to the line art and compare to your needs before purchasing.