Standard 2" O.D. - 3/8" Plain BoreMetric 49.2mm O.D. - 9.5mm Plain BoreRecommended max load.Steel Bottom = 25 lbs. 11.3kgPlywood Surface = 7.5 lbs. 3.4kg200# Test Corrugated Bottom = 5 lbs. 2.25kgWeight = 1.00 oz