Features and Benefits: 1/2″ Female x 3/8″ Male Impact Socket Adapter with Friction Ball; Made of high quality steel (chrome-molybdenum); Heat treated for strength and durability; Friction ball is a spring loaded ball that lines up with the socket retainer hole; Engineered specifically for use with impact tools, using the most up to date industrial specifications; Each socket adapter is thoroughly made with the correct balance of strength and durability and is tested to the highest specifications to deliver outstanding performance at the most competitive cost.