This is an aluminum column shim made by Nitto.
It is used when installing a 1-1/8" size stem on a 1" steering column.
Can be used with SimWorks stems with a column height of 40~42mm, but not with Anna Lee stems, etc.
Please note that there are some minor storage scratches.
Diameter : 25.4 x 28.6mm
Height : 38mm