Johnson Level & Tool JTS54HD 54-Inch Heavy Duty Aluminum Drywall T-Square 54-inch heavy duty T-square that's ideal of general carpentry use 3/16-inch thick extruded aluminum blade and head with anodized finish Screened, thermal bonded 1/8-inch gradations in black Solid 4-rivet construction; head permanently bonded to blade 1-year limited manufacturer's warranty