Strong all metal construction, can be mounted on a table upto 2 inch (50mm) thick. Aluminum Pulley, 1.125 inch (30mm) diameter, mounted on a vertically height adjustable bracket, which can slide up and down, and can be tightened at any point, from being parallel to the clamping surface, upto 2 inch (50mm) higher to the clamping surface.

SEOH Aluminum Pulley 30mm Diameter Bench Mounting Adjustable - BJ468NFA3