One fits for 1/8″-NPT PTF grease zerk fittings, M10x1 and Grease Zerk fittings with hex size 3/8″ (9.5mm) & 7/16″ (11mm). One fits for Fits 1/4″-28 SAE, M8x1 and Zerk fittings with hex size 5/16″ (7.85mm) & 3/8″ (9.5mm).
One fits for 1/8″-NPT PTF grease zerk fittings, M10x1 and Grease Zerk fittings with hex size 3/8″ (9.5mm) & 7/16″ (11mm). One fits for Fits 1/4″-28 SAE, M8x1 and Zerk fittings with hex size 5/16″ (7.85mm) & 3/8″ (9.5mm).