TRILINK 1/4"-28 Zerk Grease Fittings, SAE Grease Nipples with Straight, Grease Fittings Kit with Wrench for Quick Installation – Ideal for Automotive, Agricultural & Industrial Machinery (100pcs). Premium Quality & Unmatched Durability: Made from high-quality steel with a galvanized finish, these zerk fittings resist rust, leakage, and wear.