Kit contains: 42490 unitized sealed bearing, 2 off circlips, One off hub cap (grey), One off stake nut. Internal diameter: 42mm. External diameter: 76mm. Overall length: 39mm. Back to back cone set with split inner raceway. Suitable for use with post 1997 Ifor WIlliams assemblies. Economical replacement well suited to light and heavy industrial applications. Ifor Williams reference - 42490.