Estwing RK-7 Roofing Utility Knife 7" Go to amazon.com Related posts How to find the best roofing knife for 2022? FeatureRoofing knifeButterfly blades7 Inch lengthConsumer Pack DescriptionEstwing's 7" Roofing Knife is constructed of plated heavy gauge steel casing and cuts all rolled roofing and shingles. Comes with replaceable blades.