The Sealey 8 Piece 1/4" and 3/8" Drive Lock On Hexagon Socket Bit Set Imperial is a professional socket set designed for removing damaged and rounded fasteners. Featuring heat-treated Chrome Vanadium steel sockets paired with S2 steel hex bits, this imperial set provides a robust solution for challenging fastener situations across automotive and maintenance applications. The patented twist design delivers a unique gripping mechanism that tightens as the socket turns, making it particularly effective on rusted, damaged or severely rounded hex head fasteners. This innovative design helps prevent further fastener damage during removal, whilst the zinc phosphate finish on the hex bits provides corrosion resistance and extended service life. Supplied on a convenient metal socket rail for organised storage and workshop use, this 8-piece set spans both 1/4" and 3/8" square drive sizes. The set includes 1/8", 9/64", 5/32" and 3/16" bits for 1/4" drive, plus 7/32", 1/4", 5/16" and 3/8" bits for 3/8" drive applications. Ideal for mechanics, maintenance engineers and contractors working with imperial fasteners, particularly when dealing with seized or deteriorated fixings. Features and Benefits: • Patented twist design grips tighter as it turns for secure fastener engagement • Heat-treated Chrome Vanadium steel construction ensures durability • S2 steel hex bits with zinc phosphate finish resist corrosion • Removes damaged and severely rounded fasteners with ease • Supplied on metal socket rail for organised storage • Lifetime guarantee for long-term reliability Specifications: Brand: Premier Contents: 1/4"Sq Drive; 1/8", 9/64", 5/32", 3/16", 3/8"Sq Drive; 7/32", 1/4", 5/16", 3/8" Drive: 1/4" & 3/8"Sq Maximum Length: 48mm Minimum Length: 38mm