The Performance Tool W54218 8-Piece Metric Grease Fitting Assortment is a comprehensive kit that provides a selection of metric grease fittings for various automotive and machinery applications. The assortment includes 8 grease fittings in different sizes and styles, designed to fit metric threads commonly found in equipment and vehicles. These grease fittings are crucial for lubrication purposes, allowing you to easily apply grease to components such as bearings, joints, and pivots.