The Petzl Tibloc is the smallest and lightest ascender on the market. It will get you out of many difficult situations. You can use it as an ascender, as part of an anti return hauling system, as part of a simple pulley system, or to climb a rope. This is an emergency rope clamp grab which you should always keep close at hand. Rope diameter: 8 11mm 38 716 Weight: 39g 1.37oz Standards: CE prEN 567, UIAA Note that this item of climbing safety equipment is non returnable. Please call us toll free at 877 236 8428 or e mail bentgatebentgate.com with any questions.