Tall profile design ensures a stable and strong hold, even on irregular or round lumber edges and waning boards Extends beyond large framing lumber and conveniently attaches to most framing, carpenter or rafter squares Crafted with high-quality aluminum and black anodizing, it is resistant to corrosion and won't leave marks on lumber Perfect for repeat angle cuts, it facilitates precise measurement of right angles for stairs, rafters, and stringers, delivering fast, accurate, and uniform layouts Hexagonal shape allows for flush fit along edge keeping square perpendicular to material while providing smooth sliding action