17pc 1/2" 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. 1/2” Drive, Metric, Spline Sockets Sizes:. PLT-98310 - 10mm Spline Socket. PLT-98311 - 11mm Spline Socket. PLT-98312 - 12mm Spline Socket. PLT-98313 - 13mm Spline Socket. PLT-98314 - 14mm Spline Socket. PLT-98315 - 15mm Spline Socket. PLT-98316 - 16mm Spline Socket. PLT-98317 - 17mm Spline Socket. PLT-98318 - 18mm Spline Socket. PLT-98319 - 19mm Spline Socket. PLT-98320 - 20mm Spline Socket. PLT-98321 - 21mm Spline Socket. PLT-98322 - 22mm Spline Socket. PLT-98324 - 24mm Spline Socket. PLT-98327 - 27mm Spline Socket. PLT-98330 - 30mm Spline Socket. PLT-98332 - 32mm Spline Socket 99817