Sno-Knife® lets user easily loosen and slide snow off roof with no heavy lifting or pulling. Just slide the Sno-Knife under the snow and let gravity do the work. Lightens the heavy snow load and helps prevent ice dams. Application: Snow Removal and Prevention of Ice Dams, Blade Size (in.): 24 x 18, Adjustable: Yes, Length (ft.): 20ft. Fully Extended, Material Type: Poly Blade and Aluminum Handle, Weight (lbs.): 2.4 Requires no heavy lifting, pushing or pulling Lightweight Sno-Knife head weighs just 2.4 lbs. Work safely from the ground Unique leading edge design rides over shingles without damage No bulky frame to push through snow Works on shingles, shakes, metal or tile roofs Works on any snow, even drifted snow Slide the Sno-Knife under surface and let snow slide easily off roof Four 5-ft. snap-together aluminum poles with foam comfort grip