This Trico applicator is a handy tool for precisely applying lubricating oil to chains, cables, or other moving parts. It has a 1/8-inch NPT thread to connect to an oil line or bottle. The tip is a unique felt interior surrounded by a rubber exterior, which helps control oil flow and prevents dripping. Perfect for maintaining bicycle chains, garage door opener chains, or small machinery in a workshop or industrial setting. A simple, effective tool for targeted lubrication.