Description: Metal with hard black plastic around the outside Outside diameter: aprox. 300mm / 11.81" Center hole: 18mm / 0.71" Three mounting holes diameter: 7mm / 0.28" Mounting holes centre to centre distace: 36mm / 1.42" This high quanlity steering wheel fit many types of ATV Go Kart Buggy Quad and so on Fits 150cc - 250cc engines Package Includes: 1 Piece Go Kart Buggy Quad Steering Wheel Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!