Manufacturer part #:7212 Technical Description Features American Metric Ø base (D) 3.15 in 80 mm Weight 0.84 lbs 380 gr SWL 7936.64 lbs 3600 kg Material S.steel AISI 316 S.steel AISI 316 Fixing screws 0.15x0.31 in 4 x 8 mm d 0.47 in 12 mm D 3.15 in 80 mm