The pulley is used for altering the direction of forces.
Aluminium pulley with cord groove and a securing clamp.
The pulley has a universal frame and can be clamped in any position, to a wall, a bench, a drawing board, a corner / edge of a table etc. mm.
Also it has a bore so that it can be attached to a retort stand of up to 12.5 mm diameter.
Its two clamping screws have bakelite knobs for easy working.
Pulley=50mm in diameter.