16 mm control switches include pushbutton, keylock, selector, emergency stop switches and buzzers. ·Mounting hole diameter 16 mm.·Apparent shapes with rectangular 18 * 24 mm, square 18 * 18 mm and round diameter 18 mm.·High Bezel that prevents accidental touching.·Illuminated by midget grooved T1 3/4 lamps, including incandescent,discharged and LED lamps.·Snap-action which accelerates on-off ...