Roof-window-opening-restrictor, the zsz rod is an aluminium bar (circular in cross-section) with a plastic hook, for operation awning blinds such as the amz on windows in out-of-reach positions. standard rod length is 150cm. note: the standard amz awning blind is supplied with an 80cm rod.. The universal zst telescopic rod enables the user to operate ars, arp, arf blinds, ajp venetian blinds and ams insect screen on windows in out -of-reach positions. it also enables easy opening and closing of windows. standard rod length is 119cm, which can be extended to 134, 164, 190 and 218 cm.