• effortless caster checking • Precise determining • may be used ahead & right back • Fits X4 & X4F Precision moulded composite caster gauges for checking the caster angle of XRAY X4 & X4F. Can be used both in the front side- along with the backside linked to the automobile. Become used alongside the HUDY Universal Exclusive Set-Up System For 1/10 Touring vehicles.