The GX53 cap is 2-pin cap which (as its names suggests) has a space of 53mm between pin centres. The cap uses a simple ‘twist and lock’ mechanism and is found on disc lamps. These lamps are a typical source of light for shelves, cabinets, wardrobes, and workstations, amongst other things.
GX53 Twist-lock, GX53 Twist and Lock.
Single-Ended Metal Halide, Single-Ended Ceramic Metal Halide (CMH/CDM).