0.257 in. Min and 0.266 in. Max diameter holes in 4 places; 0.530 in. Min and 0.539 in. Max diameter holes in 2 places; approximately 46.310 in. Lg; end closure rail is used on a shipping and storage container (nsn 8145-01-116-9590pt) which holds a cover assembly that is part of the f-100 engine