Primarily designed for clamping large items during fabrication & gluing in carpentry joinery boat building & allied applications. The bar is manufactured from high quality steel & features large clamping heads which are made from malleable iron. The high grade steel main screw has wear resistant Acme threads. The unique quick-action slide adjustment is a time-saving design & the entire clamp is protected by a rust-resistant powder coating. Capacity: 1219 mm. (48 in.).