Structural Pipe Fitting, Brand and Series Hollaender Speed-Rail (R), Finish Mill, Fitting Type Rectangular Flange, Inside Dia. 1.68 in, Material Aluminum, Modular Component Base, Mounting Type Bolt-On, Nominal Pipe Size 1.25 in, Rated for Fall Prevention Yes, Series Speed-Rail (R), Guardrail Material Internal/External Reverse Knurled, Standards ASTM B179 535, Tensile Strength 32510 lb, Weight 0.58 lb