3", 4" Material: Aluminum Shape: Round Diameter Of Base: 13.9" Base Opening: 6.77" Height: 12.6" Type: 3"/4" Advantage: Heavy-Duty OEM: Acceptable *CNC Spinning Machine Max Diameter Of Raw Material: 1650mm(65") **CNC Spinning Machine Max Thickness Of Raw Material(Carbon Steel): 6mm(0.236") ***CNC Spinning Machine Max Height Of Raw Materialï¼?Carbon Steel): 700mm(27")