Drywall T-Square, Base Length 22 in, Includes -, Blade Length 47 7/8 in, Blade Material Aluminum, Graduation Marks - Base 1/8 in, Graduation Marks - Blade 1/8 in, Base Material Aluminum, System of Measurement SAE, Square Type Drywall T-Square, Edge Style Square, Features Five Rivet Construction, Finish Painted, Square Color Blue