CTA Tools 8545 Long Hex Bit Socket - 5-Millimeter is designed with a 4-inch length for deep-reach applications. It features 2-piece construction for high torque purposes. This socket uses a 3/8-inch drive. Heavy-duty construction allows for strength and durability. Whether tuning up your '68 Corvette or changing the oil on a John Deere tractor, CTA can supply you with the tools needed to do the job. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.