Dual Wheel Simulators Material Stainless Steel Finish Stainless Steel For Wheel Diameter 19.5 in Bolt Circle Diameter 275 mm Compatible Manufacturer Model Number Wheel # 28680 Wheel # 50180 Compatible with Make/Model/Year 1990 to 2010 Chevy/GMC C4500 1990 to 2010 Chevy/GMC C5500 1990 to 2010 Chevy/GMC C6500 1990 to 2003 Ford F600 1990 to 2003 Ford F650 1990 to 1996 Freightliner FL50/FL60 Includes Installation Tool Mounting Hardware Number of Hand Holes 4 Number of Lugs 8