Center Hub—The center hub is 2.88” OD x 0.203” wall with a minimum yield strength of 36,000 psi.; Arms—Arms are 2.38” OD x 0.154” wall with a minimum yield strength of 36,000 psi. The maximum straight luminaire slipfit length is 4.63” for all arm brackets. For other tenon applications, please consult factory.; Arm Attachment—Connection allows arm to be erected and held in place by gravity and secured by a single bolt.; Hardware—All structural fasteners are galvanized high strength carbon steel. All non-structural fasteners are galvanized or zinc-plated carbon steel or stainless steel.; Finish—Standard finishes are galvanized, prime painted or any of Valmont’s V-PRO Protection Systems. Additional finish options available upon request.