Works with All EMX Reflective Safety Senors like EMX-50, EMX Nir, EMX -50-325, etc. Works with All SECO-LARM Reflective Safety Senors like E-936-S45RRGQ , E-931-S50RRGQ , E-931-S35RRQ , E-931-S45RRQ , E-931-S33PRGQ Also with Any Reflective Safety Sensors, Photobeams, etc. Round reflector features one .25" center mounting hole. A simple solution to improve visibility to other motorists day or night. Color Clear Item Length (Depth) 0.29 Item Weight (lbs) 0.053 Item Width 3.16 Piece Length (Depth) 3.25 Piece Weight (lbs) 0.057 Piece Width 3.25. This reflector works with All Safety Sensors that use a Reflective Photo Eye.