GearWrench 3529D 3/8” and 1/2” Drive Heavy-Duty Oil Filter Strap Wrench The GearWrench 3529D 3/8” and 1/2” Drive Heavy-Duty Oil Filter Strap Wrench is made of high strength oil resistant nylon and the handle is made of forged steel, chrome plated 3/8” and 1/2” drive engagement, and handles filters with diameters up to 9” (229mm) especially high torque requirements on truck and tractors.