CTA Tools 9730 3/8-Inch Drive Socket Rack - Standard is designed with a nylon plastic rail that has 13 holders for 3/8-inch square drive sockets. Each has the socket size printed on the tab. Sliding holders feature spring-loaded detente balls to firmly hold sockets. Rails include mounting holes and can hold sockets ranging from 1/4-inch to 1-inch. 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.