Features and Benefits: Made of high quality alloy steel (chrome-molybdenum); Used for removing and installing transmission and differential end yoke locknuts on a wide variety of trucks; Engineered specifically for use with impact tools using the most up to date industrial specifications; Tested to the highest specifications to deliver outstanding performance at the competitive cost; Lifetime Warranty; 3/4" in. Drive x 2-1/8" in. Deep Truck Pinion Locknut