An assortment of metric grease fittings from The Hillman group ranging M6 thru M10 in regular and fine thread pitch sizes. Grease fittings provide a location within a machine or other mechanical system where grease can be forced into areas that require consistent, periodic lubrication. Full assortments of #4128 contain twelve (12) refills comprised of Hillman item numbers #4129 - #4140.