available in three sizes:
0.6mm inner diameter, 0.8mm outer diameter, 2.3mm long
0.8mm inner diameter, 1mm outer diameter, 2.3mm long
1mm inner diameter, 1.5mm outer diameter, 2.7mm long

Can be used as adapter between different sizes of axles and holes, as a bearing or to control axial movements of shafts. Made out of copper. Depending on what they are used for it might be necessary to adjust the diameter by drilling, reaming. Definitely a problem solver if you do not have access to a lathe.