Tibloc Ascender. Simplicity often yields the best results. This simple taco shaped piece of metal is really a cam that can lock over a rope and press it against a karabiner. The result is the lightest weight emergency ascender you can buy. Superb for crevasse rescue and hauling, or running along a fixed rope back up on slopes. Note that the Tibloc is for emergency or occasional use only and care must be taken to engage the cam correctly. Use with a minimum of 10mm
Diameter, round or oval-stock locking karabiners.
Use with ropes 8 to 11mm.