The PTSA-03 is an accessory short arm used to mount underwater strobes such as the UFL-1 to the accessory shoe of the PT series underwater housings. It can also be used for attaching a focusing light to the housing when using the underwater strobe on an external bracket. It is made of a corrosion resistant plastic resin and features a large easy to turn knob, making for easy swivel adjustment even when wearing dive gloves. Attaches to any Olympus PT series housing that has an accessory shoe.