13pc 3/8" Dr Metric Spline Socket Set Spline feature works on: Spline, 6 pt., 12 pt., Star, Square and Rounded Hex fasteners. Manufactured using quality chrome-vanadium alloy steel. Heat-treated for strength and durability. Meets or exceeds ANSI specifications. 3/8” Drive, Metric, Spline Sockets Sizes:. PLT-98210 - 10mm Spline Socket. PLT-98211 - 11mm Spline Socket . PLT-98212 - 12mm Spline Socket. PLT-98213 - 13mm Spline Socket. PLT-98214 - 14mm Spline Socket . PLT-98215 - 15mm Spline Socket. PLT-98216 - 16mm Spline Socket. PLT-98217 - 17mm Spline Socket. PLT-98218 - 18mm Spline Socket. PLT-98219 - 19mm Spline Socket. PLT-98220 - 20mm Spline Socket. PLT-98221 - 21mm Spline Socket. PLT-98222 - 22mm Spline Socket 99813