Torx socket sets are used for external Torx Bolts, Torx socket set sizes for all automobile applications include sizes E-6 through E-20, This is 1 of the 10 sizes, 3/8"" Drive External Torx Socket E-16, Made of heat-treated alloy steel, Dimensions: 1, 1"" x 1"" x 4"", SKU: WTD3467