The Ushba Basic Ascender Sport is a trustworthy supplemental ascender thats compact and easy to use. The aluminum-bodied Basic Ascender is designed for use with haul systems on alpine ascents, for crevasse rescue or as a top rope self-belay device. The smooth-running toothless cam design wont slip on icy or muddy ropes, making it ideal for harsh alpine climates. The Basic Ascenders dimensions are 3 x 2 x .75in, and has a rope holding strength of 4kN/900lb. Not for use as a lead belay device.