Set contains standard length fractional sizes 3/16"" to 1/2"" and Metric sizes 5mm to 15mm along with a 2"" extension and 1/4"" x 1/4"" universal joint, The powerful magnets hold any fastener securely, Great for use in impact or non – impact applications, High quality chro-moly alloy steel, GP High Torque Drive Socket design for increased strength with reduced chance of fastener rounding, 23 piece set contents:, 9 Pieces Fractional Standard Length: 3/16"", 7/32"", 1/4"", 9/32"", 5/16"", 11/32"", 3/8"", 7/16"", 1/2"", 12 Pieces Metric Standard Length: 5mm, 5, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm , 13mm, 14mm, 15mm, 1 Piece Extension: 2"", 1 Piece Universal Joint: 1/4"" x 1/4"", SKU: ISN12709