Tapered roller steering head bearing kit for Ducati bevel drive singles. Kit fits W/C bevel singles and N/C bikes with clip-ons ONLY !!!. Will NOT work on N/C singles with clamp on handlebars as the handle bar U bolts interfere with the bearing cups. This kit replaces the original factor bearings that have loose ball bearings. Kit include custom made Aluminum bearing cups, tapered bearings and seals. Kit includes all parts in the photo. NOTE: There is different lengths of steering stems depending on the manufacture of your forks. On some bikes the steering stem will not be long enough to get the top nut on sufficiently. Your top crown will need to be machined down to a accommodating thickness. These kits are not a bolt on item and may require substantial work to fit. Not for the faint of hart or inexperienced moto mechanics.