1-3/4" Extension Made of high quality steel (chrome-molybdenum) Extension is made with a friction ball Tested to the highest specifications to deliver outstanding performance at the most competitive cost Lifetime warranty This 3/8" drive, 1-3/4" extension is made with the friction ball. A spring loaded ball that line up with the socket retainer hole. Use caution when using this system because the socket is held in place only by spring pressure on the steel ball.