Superior rugged materials and design for high impact strength. • Hard tempered aluminum blades securely riveted to black plastic t-head. • Heavy Duty T-Squares made from extruded aluminum and calibrated to 32nds through the first 6 along the top edge cm and mm calibrations along the bottom edge. • Extra-wide 14 head is attached with 5 rivets and calibrated to 5 on each side of the blade. • Size: 1-1/2 x 24 . • Description: standard.