Authentic TORX fasteners and drivers are manufactured to very critical proprietary tolerances Manufactured with premium quality tool grade steel and are manufactured as two-piece construction for even stronger performance These high quality bit sockets will provide a lifetime of performance when used with hand tools Kit comes with one each 1/4 inch drive 8IPR 10IPR 15IPR 20IPR 25IPR 27IPR 30IPR 3/8“drive 40IPR 45IPR 50IPR and 55IPR Tamper-Resistant TORX Plus Sockets