The Mighty-Seven EZ Grease Series utilizes an innovative, greaseable anvil to give users more life and power over a longer period. All air tools lose efficiency over time, but users can get that back with EZ Grease, says the company. Like most impacts, M7 uses a standard grease port, directing grease into the front portion of the impact. With EZ Grease, you can inject grease easily and further into the highest stress area of the tool. Available in three models from 650 to 1,200 ft-lbs of torque: NC-4650HB, NC-4233QHB, and NC-4255QHB.