Durable pump assembly and heavy-duty reservoir are designed to increase productivityPump Assembly - 50% more oil per stroke than other hand-held oilers for longer die lifeErgonomic 2-finger trigger designDie cast, heavy-duty body with swivel nozzle with no exposed parts for longer lifeHeavy-duty reservoir that will not crack or leakThe material withstands abrasion, is lighter than metal and does not rust