Equipped with thickened 6 and premium synthetic rubber seals, withstands up to 12, 000 pressure to secure oil sprays without leakage or waste Features ergonomic double handle structure for easier pressing and compared to single handle models, providing stable grip even in tight, greasy workspaces with 1 handed operate capability Constructed with high hardness stainless steel and alloy materials featuring rust resistant plating, tested for tens of thousands of spring cycles to maintain in extreme conditions Standard 1 / 8 " internal thread fits 99% of grease tool tubes worldwide, suitable for metric / royal fittings ( 6mm M14) including Zerk fittings for versatile applications Unique auto design allows tool easy operate after securing the grease fitting, enabling simultaneous use with manual, pneumatic, or lithium powered grease for efficient maintenance, Manufacturer: Beimus