Flash Clamp and Locking Arm From JOBY &ndash; the Most Versatile Off Camera Flash Mounting System You Can Find Set up better lighting: Secure flashes on a variety of surfaces up to 2" wide - such as a railing, pole Reliable hold: The ultra-stabilized, sturdy Flash Clamp & Locking Arm allows the off camera flash to stay in position, even for long-duration shots Variable adjustments: The Locking Arm allows quick positioning of your flash at various angles to get the absolute best lighting angle Versatile set up options: Whether attaching to a street sign, or configuring the set up on a tripod, the options and angles are endless.