Stanley fatmax auto trigger clamps stanley 9 83 123 the clamping pressure on this fatmax auto trigger clamp is a massive 200kg and the patent pending spring closure mechanism offers fast closing and clamping li the clamp quickly converts to spreading mode without the use of tools and the dual pivot trigger delivers fast closing and easy application of pressure the reinforced nylon and steel construction provides strength and durability and the removable jaw pads protect the work piece from