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 6” for all 4’-0” arms and 12” for all 6’-0” arms. For other applications, please consult factory.; 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 either Galvanized (GV) and Finish Painted (FP). Additional finish options like Finish Paint over Galvanizing (FPGV) or any of the V-PRO Finish Coating Systems are available upon request. See order codes for color options.