2807 Series Stainless Steel Shim (6mm ID x 9mm OD, 0.25mm Thickness) - 12 Pack

These 0.25mm thick stainless steel shims are intended to provide a small amount of necessary space between a 6mm bearing, and the next component in your assembly.  Since the inner race and outer race of most bearings share the same thickness, there’s potential for an item that extends over the outer race to scrape as it rotates.  By adding a shim, that part can rest against the shim and rotate freely without contacting the outer race.