JLT1182 Features: * Aluminum rafter square * Permanently stamped numbers and graduations * Rafter and essex board measures * Will not rust or corrode * 24"" x 2"" Body, 16"" X 1-0.5"" tongue, 0.13"" thick Construction: * Aluminum construction with anodized finish Dimensions: * Dimensions: 24"" H x 16"" W x 0.13"" D