SMC UIAA Certified Capra Axe 3 Sigma MBS: 26kN 5,845 lbf. Sheave: 2" aluminum Uses four high efficiency sealed stainless steel ball bearings and is designed to function flawlessly under conditions that would shut down lesser grade pulleys. Max. Rope: 1/2'' (13mm) Multiple independent attachment points Fits up to 13mm cable