8-5/8" x 8" Bogey Wheel8 5 8" x 8" Bogey Wheel Bogey wheels are made from schedule 40 pipe with strong steel tubing weld to 1 4" thick end plates. Carbon steel axle is drilled, cross drilled and includes a recessed zerk fitting Tread & Core: Schedule 40 Pipe Axle: 1 1 2" Diameter x 10 1 2" L Carbon Steel w Recessed Zerk Fitting Color: Black Silver Schedule 40 Pipe Wheel Diameter 8 5 8" Tread Width 8" Tread Type Schedule 4 Pipe Core Type Schedule 4 Pipe Axle Bore Diameter 1