Self Retracting Lifelines (SRL) are a specific kind of lanyard used with a safety harness that utilizes inertia to activate a breaking mechanism that is part of a block unit housed inside the body of the lanyard. This mechanism is typically activated when the fall distance exceeds four and a half feet per second. This inertia threshold activates a machined outer ring with spring loaded arms that arrests the fall. CRS carries several options to keep you employees safe when working from heights, including Leading Edge (LE) situations. If you do not see what you are looking for on this page, please call CRS at (800)267-2308 and ask for an e-commerce representative.