Nocturnal Lights YS Arm Adapter for M700 Lights ADP.M7YSYS style light adapter holds the M700i and M700t lights tightly in place using an aluminum light holder, allowing you to switch the light on and off easily without ever having to worry about the light slipping out. The light older itself has a 1 4" thread on the bottom and the YS attachment can be removed for additional mounting options. This attachment will work with all of the "YS" type of light arms in the market.