HBFST Nema 1 Interior Tamperproof Open-Close Key Switch With Stop Button In Single Gang Back Box Flush Mount.OPEN-CLOSE with Center Return Key Switch with Stop Button, Mortise Cylinder, Tamperproof, Stainless Steel Faceplate, Faceplate: H= 4-1/2"", W=2-3/4"", Back Box: H=4"", W=2"", D=2-3/4"".