1aluminum alloy tubing per ww-t-789; 0.875 in. Diameter 8.560 in. Lg; one end flattened to 1.250 in. Lg; 2 holes in line 0.189 in. Min, 0.192 in. Max dia; one hole in line on flat end 0.194 in. Min, 0.197 in. Max dia; surface finish 250 microinch rms