Industry-standard 18 mm diameter threaded body has flat sides allowing it to be mounted like a tubular sensor or against any flat surface. Right-angle viewing models mount in a depth of only 6/10th of an inch. Perfect Prox technology provides exceptional background rejection and application problem-solving. Visible sensing beams let you see where the beam is aimed for quick setup and alignment. Solid polyurethane housing completely encapsulates internal circuits for high resistance to shock and vibration.