Miller by Honeywell Lifeline, Leading Edge Self-Retracting, Series: MightyLite, 310 to 400 lb Load, 20 ft Length, Galvanized Steel Line, Aluminum/Steel Housing/Stainless Steel Mainspring/Stainless Steel Break Pawls Hardware, 3000 lb Tensile Strength, Specifications Met: ANSI A10.32, ANSI Z359.14 Class B.The miller MightyLite leading edge self-retracting lifeline LE SRL is designed to protect a worker from a fall that involves going over an edge. The MightyLite LE SRL features a shock-absorber integrated into the lifeline, lowering fall arrest forces.