Product Description No.5690 – Universal Drain Plug Wrench Set 12 Piece drain plug wrench set will enable you to reach into confined areas for removal and replacement of both internal square and in-hex filler and drain plugs on gearboxes, differentials and engine sumps. Wrenches feature 3/8″ Drive and hole for tommy bar. Hexagon Sizes: 5/16″, 3/8″, 8mm, 9mm, 10mm, 12mm, 14mm, 17mm. Square Sizes: 5/16″, 3/8″, 11mm, 13mm. Universal Sliding T-bar.