MBS Rating (lb): 4,000 MBS Rating (kN): 17.8 Available Lengths: 30 web wheels and 300 spools The standard in 1" webbing, Mil-Spec tubular webbing is favored by climbers and rescue specialists for slings and anchor systems as it offers exceptional abrasion resistance. As its name implies, Mil-Spec is also the standard webbing for military applications.