90 Degree Bracket Roof Jack is made from 11 gauge steel. These high-quality, made in the United States heavy-duty roof brackets provide confidence to roofers whose lives rely on this product. Also can be used to hold plywood sheets on the roof prior to sheathing. Brackets are available in a variety of sizes to meet roof pitch and width requirements. Maximum Load Rating of 250 lbs. Board is held at a 90 degree angle from the roof surface.