Biner Blocks and Pull Cord Techniques for Backcountry Canyoneering Knowing how to rig a carabiner block (biner block) and pull cord allows for retrievable single-rope rappels, creating several advantages for the backcountry canyoneer. Read More Rigging the Rope, Tech TipstjonesApril 27, 2012biner block, Canyoneering, carabiner block, pull cord, tech tips, Knots for Rope, Knots for Canyoneering, knots