California Proposition 65: This product contains a chemical known to the State of California to cause cancer. California Proposition 65: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm.Air impact wrenches are extremely useful when it comes to loosening machine tightened nuts and bolts, which are often more secure than hand-tightened nuts and bolts. Product specs for this Air Impact Wrench Kit include the following: SQUARE DRIVE SIZE: 1/4", DUTY: General, OVERALL LENGTH: 6.9"