Grease Fitting Removal Tool: One removal tool is designed for 1/8in-NPT grease fittings, M10x1 connectors, and hex sizes of 3/8in (9.5mm) and 7/16in (11mm) grease fittings. Another removal tool is compatible with 1/4in-28 SAE, M8x1 connectors, and hex sizes of 5/16in (7.85mm) and 3/8in (9.5mm).