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An emergency belay device compatible with single ropes and slings, the Kong USA Duck ascender is a superlight and easy way to be prepared for self-belay, rescue, progression maneuvers, or daisy chain regulation.This product will be shipped directly from Kong USA and will leave their warehouse in 2-3 business days. Eligible for UPS ground shipping only.. . . Made of lightweight aluminum alloy. Accommodates ropes 8-13 mm in diameter, or slings 10-15 mm wide. Small size allows for easy, one-handed installation on the rope. Large hole accommodates any locking carabiner. Certified EN 567:97; conforms to UIAA standards. Every piece of Kong USA gear is tested and checked for safety.