40 inch air vise has twin rails and twin motors! This BIG boy is built for those doing high production and need to clamp a ton of molds!! All aluminum is 1/2 inch thick and they are 4 inches tall x 12 inches wide!! All aluminum is USA made! Each vise comes with a air pressure regulator and push-pull style valve! Each vise will come with 10 feet of hose and an adapter to install in your air adapter for your compressor!! Some assembly will be required as this unit is so big I’ll have to disassemble the unit and ship the rails separate!! Shipping will be more expensive on this unit as it will be shipped as two pieces!!