This clamp with pulley is made out of high quality stainless steel. Resistant against all weathers. The clamp is appropriate for tubes with a diameter of at least 25 mm. The direction of the clamp is not adjustable. The roll of the pulley is suitable for ropes with a diameter up to 9 mm. Measurements of pulley: length: 80 mm width: 63 mm weight: 105 g measurements of clamp: length: 62 mm width: 25 mm