Hiqh quality reproduction of a useful period tool. Drive in the wedge shaped front section between the leaves of the spring and connect a grease gun with a standard hydraulic coupler to the integral grease nipple to introduce grease between the leaves of your spring. Machined from stainless steel with a zinc plated steel grease nipple fitted. Knurled body. 5/8" diameter, 5 3/4" long.