Open Box Dealer Demo Petzl Rack Descender One Size D11. Specifications for Petzl Rack Descender: Manufacturer: Petzl Size: One Size Fabric/Material: Stainless steel frame aluminium bars Weight: 16.5 oz Rope Capacity: Single ropes (9 to 13 mm) double ropes (8 to 11 mm) Features of Petzl Rack Descender Simple to use:- Very easy to use; the bars engaged on the rope can be adjusted at any time to obtain the desired amount of friction- Compatible with 9 to 13 mm diameter low stretch kernmantle ropes Suited for long descents (over 80 meters):- Can be used on two rope strands with 8 to 11 mm diameter low stretch kernmantle ropes- Good distribution of friction and heat helps preserve the rope- Does not twist the rope Lifespan of the device can be optimized by replacing the brake bars (D11300 D11250 and D11200) Package Contents: Petzl Rack Descender Petzl D11: Rack Descender One Size