Black Diamond Nylon Runner. 60 cm Length. Use them to reduce rope drag and keep your rope running straight. Tie them off on chicken heads, trees and chockstones or use them to equalize pro. They are durable, versatile and essential for most types of climbing. Minimum strength: 22 kN (4946 lbf). Versatile and essential for straight-running ropes. Great for lengthening or equalizing pro. Optimal lengths for eliminating rope drag.