Material: AluminumSpan Length: 44"Standoff: 10"Fits 1-1/4" Round Rungs And Most Flat RungsSpring-Loaded Locking Latch Makes It Easier And Quicker To Install And Remove, Requires No ToolsMar-Resistant Rubber End Caps Protect Work SurfaceDo Not Use In Conjunction With Ladder Jacks Using Planks Or StagesNot For Use On Type III (200 Lb.), Type II (225 Lb.) Fiberglass Extension Ladders Or Werner MT Series LaddersNot For Use On Ladders Over 40'