Fairgate Rule Company CBT12 Cork Backed Standard T-Square 12 in. 1.5 in. wide aluminum blade with deeply cut&#44; highly visible graduations Cork backed&#44; non-slip blade is securely riveted to durable&#44; high-impact 9 in. wide plastic head Blade graduation in 8ths and 16ths; head graduation in 8ths Cork Backed Standard T-Square 12 in.