When it comes to rigging with big ropes, you need to consider this big tailboard block to match! New from CMI is this beef master of a block designed (originally by West Coast arborist Ed Hobbs) for rigging big wood with big ropes. A key feature of this mostly aluminum design is the large diameter sheave (4.5-inches) that minimizes the bend radius of the guest rope to lessen fiber distortion, that is known to amplify heat and lower tensile strength. Large and in charge (not to mention lightweight) is what will happen on the job with this masterful work of modern technology and American craftsmanship! Aluminum side plates, bushing and sheave, with stainless steel axle and bronze bushing. No lubrication required.