The #1 Ascender is intended for climbing ropes and pack hauling by mountain climbers and cavers. It is NOT intended for litter raising or the support of more than one person or for self belay. It features an aluminum shell, free running cast aluminum cam and is intended for 7/16" (11mm) and 1/2" (13 mm) ropes. Breaking strength 2,550 lbf. (11.34 kN). Made in the U.S.A.