60mm 70mm 75mm Inner Diameter Black Drilling Open Hole Protector Armature Single Side Wiring Cable Rubber Ring Gasket Grommet|ring gasket|rubber ring gasketsrubber wiring grommets - AliExpress
Amazon.com: uxcell Nitrile Rubber O-Rings, 60mm OD 54mm ID 3mm Width, Metric Sealing Gasket, Pack of 10 : Industrial & Scientific