FAIRGATE Aluminum T-Square 24" Aluminum ruler with plastic t-head. In inches calibrated to 1/16ths. Excellent for students, designers, artists and others whose work environment does not subject tools to excessive abuse. Blade calibrated two edges, one side; head calibrated left and right from center point, bottom edge, one side. Head width: 9" This aluminum T-square has a plastic head, with a high-tempered alloy blade .081" gauge, 2" (51 mm) wide. Legible markings are graduated in 8ths on one edge, 16ths on the other edge.