AXIS T91B51 Ceiling Mount is compatible with all Axis PTZ dome cameras and outdoor models of Axis fixed domes. AXIS T91B51 mount is ideal for environments with low ceilings. It lets you easily mount cameras extremely close to the ceiling. It is also appropriate for offshore and outdoor applications. If a longer pipe is needed there is a 30 cm (12 in) and a 100 cm (39 in) optional extension pipe available. In addition, it will stay perpendicular even when mounted on a sloped ceiling.AXIS T91B51 features a swivel function that allows it to swing safely out of the way if it is accidently hit by, for example, a tall vehicle or forklift. In addition, AXIS T91B51 is rated IK10 for vandal resistance and NEMA 4X for corrosion and salt spray resistance.