Petzls Basic ascender is a small, practical and designed for ascents on single ropes. With only 90 grams, this compact ascender is almost as light as a feather. It is designed for single ropes with a diameter of 8 to 11 mm. No matter if youre into big wall climbing or cave exploration, the Basic by Petzl wont let you down. Its casing is made of lightweight aluminium and the cam lobe itself consists of stainless steel. The lower hole is large enough for two carabiners. See you at the top - with the Basic by Petzl!