Snap On FDX 3/8" Metric Socket Set 12pc 112YTMMY112YTMMY For sale is a 12pc Snap On FDX socket set Metric, in 3 8" drive. Sizes 8 19mm. The sockets are in good used condition. FDX are specialty sockets that have an extra tight fit on hex fasteners. They are slightly undersize compared to regular flank drive sockets. This makes removing rusty or rounded fasteners much easier, without rounding. Please reach out with any questions you may have. I reply promptly, and strive for excellent customer