Table Clamp Pulley, 50 mm, ABS Plastic, 1 Each

The Table Clamp Pulley, 50 mm, ABS Plastic by United Scientific is a bench-edge pulley with a 50 mm smooth-rotating ABS plastic wheel on an adjustable 140 mm, 8 mm diameter steel rod. It clamps to table edges up to 53 mm thick, and a locking knob sets the pulley top anywhere from 27 mm to 140 mm above the table. Physics teachers use it for hanging-mass experiments with carts and blocks, such as Newton's second law and friction labs.