Qual-Craft 2481 Ladder Hook with Roller, Red, SteelHighlights: Color : Red Material : Steel Height : 13 inch Width : 1. 5 inch Length : 21. 5 inch Weather Resistant Adjustable Includes Hardware Adjusts to fit between top 2 ladder rungs Fits single or extension, wood, fiberglass and aluminum ladders with round or D rung styles When used with a paired ladder hook, both hooks fit over the top two rungs of the ladder and hook over the roof edge Then the wing nuts of both hooks are tightened, holding the