ISC Arborist Block 16mm (5/8") Boots It accepts up to three

It accepts up to three carabiners

Used to attach the steel sleeve onto the shank

If you're not sure why you'd want to do this

No climber should be without a friction saver

With the swing open side plate you can easily attach mid-line

ISC Arborist Block 16mm (5/8") Boots It accepts up to threeISC 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