The Sealey 13 Piece Impact Security Torx Socket Bit Set delivers professional-grade security fastener solutions for automotive and general engineering applications. This comprehensive socket bit set features drop-forged one-piece Chrome Vanadium steel construction, specially hardened and tempered to withstand the high torque demands of impact driver use. Each security TRX-Star* socket bit is manufactured to precise tolerances, with the centre pin designed to engage tamper-resistant Torx fasteners commonly found in modern vehicle assemblies, electronics, and security-sensitive applications. The black oxide finish provides enhanced corrosion resistance whilst reducing glare during precision work. The set provides extensive coverage across two drive sizes, with six 1/4" square drive bits (T10H through T30H) ideal for smaller security fixings, and seven 3/8" square drive bits (T40H through T60H) for larger automotive and industrial applications. A 3/8"Sq(F) x 1/4"Sq(M) adaptor is included