Grease zirk protection rings, sold in lots of 10. You also get a spare greasezirk. These protection rings are standard equipment with the TD66eos/Blue Line,the TD92eos/Red Line and soon to be released TD13eos/Green Line (customerinstallation required).Simply remove your grease zirk, place the protection ring over the hole andre-install the grease zirk. Zinc Coated Designed to prevent damage to grease zerk Sold with new zerk Pack of 10