Double Parallel Pulley, 50mm Plastic, Hook at each end

Double Parallel Pulley, 50mm Plastic, Hook at each end. Black plastic pulley has two wheels in parallel, 50mm in diameter, inside a metal housing with a hook at the top and at the bottom. Used for science experiments in physics, demonstrating force. SKU P4030 FEATURES: Double Pulley, Side-by-Side Black Plastic Wheels 50mm Diameter Metal Housing Hook at Each End Useful for Force Demonstration and Other Experiments