Machined from 6082-T6 aluminium.
Fits under the lower head bearing when fitting later front ends to older bikes, e.g.
TZR250 3MA/3XV into RD350LC
RGV250 into RD350 YPVS
FZR400 3TJ into RD400
etc.
Much nicer than using the old bearing race...
Toolbox stickers with every order!