Mega-Gridlock, Aluminum Finish Minimum Size: 1.25" pipe, 1.66" Outer Diameter pipe Specifications: Minimum Size: 1.25" pipe, 1.66" OD pipe Maximum Size: 1.5" pipe, 1.90" OD pipe, 2" OD truss tube Safe V. Working Load: 1250 lb 568kg Hardware: 4 each  5/16"  2" socket head cap screws. 4 each  5/16" Nylock nuts Diminsions: 3.65"  3.65" x 4.375" tall max (.375" plus the thckness of the 2 pipes joined.) Weight: 15 oz