Heavy-Duty Truck Oil Filter Wrench (4-1/8" to 4-21/32"). Wrenches are designed for high torque requirements of truck filters and used with 1/2" square drive tools. They have 3" wide bands for added strength and increased grip area. Fits Ford 6.9L Diesel Oil and Fuel Filters and Most Mack Truck Filters. CAUTION: Do not use with power tools.