New old stock heavy plated steel hub. 4-1/8" across the inside. 1" thick overall, 7/8" deep on inside of hub. Mount holes are 5/16". Mount holes are 2-13/16" apart from each other if you measure from hole to hole across. Center hole is 1-5/8" across. Any questions please ask. I won't end any of my auctions early and if it is a "buy it now" it will be stated that way. Be sure to check my other auctions for more hard to find items. I do not take offers on my items, my prices are firm unless otherwise stated.