12 pc. 3/8" Dr. Metric Hex Bit Socket Set Patented bit holding system forces bit surface to opposing side for maximum bit retention. Entry angle guides fastener. Serration depth as deep as the fastener. Large hard stamped identification. KD Sockets use a Double Line (SAE) & Knurled Line (mm) to easily identify Standard vs. Metric Sockets. Packaged in patented impact Òslide rail system for easier positioning of sockets. . Internal slides eliminate interference. . Features Ball Bearing Retention Set Includes:. 2, 2.5, 3 - 12mm Bit Sockets 80580 No -