My honest take, it’s two small and brittle for marking large sections of shingles, but it’s surprising how well it mark up wood, metal, and dirty surfaces. A lot of times I use a markers and they get dirty easy and go right in the trash. Still using lumber crayons on the roof but rail, pipe, siding, soffit, stucco, anything it’s better then a marker. The other thing that’s nice about it is the tip is smaller and works well for marking where the pilot holes are for mounting different boxes on the wall. #o#oxtoolsO@OX TOOLS North Americat#toolreview