"Material: aluminum alloy, temperature T6, conforming to QQ-A-250/12; Finish: anodize, type 1, in accordance with MIL-A-8625; Overall dimensions: 6.969 inches long x 2.5 inches wide x 1 inch high; Four holes tapped through countersink 110 degrees to a diameter of .313 inches, using tap drill .313-18 UNC-3B; Two holes tapped at a depth of .875 inches for .5-13 UNC-3B and at a depth of .813 inches."