Powerful magnets hold any fastener securely Made of high quality steel (chrome-molybdenum) Packaged on a metal clip rail Lifetime Warranty This set contains standard length, fractional sizes. Each socket 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. Set contains the following: Fractional sizes 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16" and 3/4".