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.; Set Contains 23 Pieces; 1/4" Dr. 23 Pc. Std. Length SAE/Met. Magnetic Set ; Molded Storage Case ; Weight: 1.83 lbs.