Arborist Blocks

Arborist rigging blocks are oversized pulleys that attach to the tree with a rigging sling.  Rigging blocks are used for heavier material and vary by rope diameter capacity.  Some are stainless steel, but others are cast from aluminum.  They open with a spring loaded knob or threaded screw locking knob.  Arborist rigging blocks are useful for bigger material or negative rigging when appropriate.  Blocks are attached to the tree with a rigging sling such as an Eye Sling or a Loopie Sling.