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- optimized for application
but also avoid snagging when passing through tight branch forks
Available in two different lengths
lowest stretch and longest wear life available
ISC Arborist Block 16mm (5/8") Size:Default - optimized for applicationISC Alloy Arborist Block 16mm (5 8"). The RP051 from ISC is a cast aluminum block made from high tech aluminum alloy. It is incredibly light, but strong. Aluminum alloy bushings and sheaves are supported by stainless steel axles. Spring lock captive bushings are easily accessed by a quick twist nob. Sheave is supported by a sintered bronze bushing. Side plates are broad enough to protect lines during use and painted with a powder coated finish. The