Fairgate 30-Inch Lightweight Aluminum T-Square (L30) Aluminum T square with high impact plastic head Several sizes to fit your drafting table Highly visible cut graduations at 8ths and 16ths Lightweight hardened aluminum blade one and a half inches wide 1.5 inch wide aluminum blade with deeply cut, highly visible graduations. Blade securely riveted to durable high impact 9 inch wide plastic head