Manufacturer part #:7220 Technical Description Features American Metric Ø base (D) 5.08 in 129 mm Weight 3.97 lbs 1.8 kg SWL 19841.6 lbs 9000 kg Material S.steel AISI 316 S.steel AISI 316 Fixing screws 0.23x0.39 in 6 x 10 mm d 0.79 in 20 mm D 5.08 in 129 mm