Walboard Tool 88-012/WTS-50 48" Drywall T-Square Calibrated to +/- .020 at crossing and top to bottom, insuring accuracy, especially on longer 48" cuts Heat-treated aluminum construction is long lasting and gives metal it's spring or "memory" Anodized finish helps prevent rusting, extends life of print Crosshead is angled for added strength and durability Aircraft alloy steel rivets