This basal anchor sling from Rope Logic is used to anchor your single line to the tree. This concept was designed by Todd Kramer of Chicago. It allows the SRT climber to be lowered to the ground by his coworkers in case of an emergency rescue. It is comprised of a tachyon sling stitched onto a CT Rigging plate. The sling is adjusted in length with a prusik loop (not included) which is run through the plate and attached to the lowering device.