Three element lens assembly with coated optics. Front lens clear diameter is 16mm, rear lens diameter is 8mm diameter. The front focal length of 40mm is taken from the center of the assembly. The front cell diameter is 22mm by 7mm wide. Rear element barrel is 13mm diameter by 4mm long threaded. On the threaded end fits the internal threaded mounting bracket. There are (3) 2mm holes for mounting. Total length of the assembly is 14mm long. These are Jaegers inventory labeled as "Camera lens".