Designed for use without an insert. Provides good basic protection. Cutting and drilling is equivalent to wood Tight radius forming may require preheating Dimensions are given for the orientation shown in the illustrations Drilled and countersunk on 6" centers, except Series 0205, 0845, 3670, & 3671 are drilled and countersunk on 8" centers Note: due to their length, these items must be shipped via truck or air freight