Amazon.com: uxcell Nitrile Rubber O-Rings, 34mm OD 28mm ID 3mm Width, Metric Sealing Gasket, Pack of 10 : Industrial & Scientific
0.9mm Height Waterproof Red Gasket Watch Caseback O Ring 18.5mm-28mm Outside Diameter for Timepiece Repair - AliExpress
MAEDLER deep groove ball bearing single row inner diameter 15mm outer diameter 28mm width 7mm shielded on both sides SKU: 61902-ZZ-MAE - Maedler North America
Festool FJ499811 Radius Router Bit for Edge Banding, 28mm Overall Diameter, 3mm Cutting Length, 1mm Radius
uxcell Nitrile Rubber O-Rings 28mm OD 25mm ID 1.5mm Width, Metric Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific