The Light Source Mega Clamp Black Minimum Size 1" pipe, 1.315" OD Maximum Size 2" pipe, 2.375" OD Safe Vertical Working Load 600 lb 273 kg Hardware 1/2  1 long hex head Grade 5 zinc bolt 1/2  3 long square head set screw Belleville spring washer Dimensions 5.875" tall x 3.675" wide x 1" thickWeight 13.4 oz