Block roller "Tandem" dural - block with two consecutive rollers. It is applied on crossings with a small inclination. It has a minimum weight. Cheeks and rollers are made of dural. Available with the plain bearing. Works with a rope with a diameter of up to 13 mm. The product can be used for rope crossings and in rope parks. The maximum speed is 10 m / s. Exceeding the specified speed, as well as the use of the product on a steel cable is prohibited because may lead to the destruction of the roller.