Hahnel Module 600 Clamp
The Hahnel Module 600 clamp is for the Hahnel 600RT flash range. However it can fit other flashes up to 80mm in width.
Velcro can be extremely frustrating when attaching accessories to Speedlight’s. The hähnel 600 Clamp has an extremely powerful magnetic system allowing accessories to be attached in seconds. These high grade magnets are not only exceptionally strong but also highly reliable as they firmly attach our Module accessories onto the clamp.
Find the manual here