The Sealey 8 Piece 1/4" and 3/8" Drive Lock On Hexagon Socket Bit Set is a professional metric socket set designed specifically for removing damaged, rusted and severely rounded hex head fasteners. This specialist tool set combines heat treated Chrome Vanadium steel sockets with hardened S2 steel hex bits, making it an essential addition to any professional mechanic's or engineer's toolkit. The patented twist design represents the key innovation of this socket bit set, gripping tighter as you turn to prevent fasteners from rounding further during removal. Each bit features a zinc phosphate finish for enhanced corrosion resistance and durability, whilst the professional-grade Chrome Vanadium steel construction ensures long-term reliability under demanding workshop conditions. This 8-piece set covers commonly used metric sizes across two drive types: 1/4" square drive sockets in 3mm, 4mm, 5mm and 6mm, plus 3/8" square drive sockets in 7mm, 8mm, 9mm and 10mm. The metal socket rail keeps all pieces organised and easily accessible, ideal for mobile mechanics, workshop professionals and maintenance engineers working with damaged fixings. Features and Benefits: • Patented twist design grips tighter as it turns, preventing further rounding of damaged fasteners • Professional heat treated Chrome Vanadium steel construction for durability • S2 steel hex bits with zinc phosphate finish resist corrosion • Supplied on metal socket rail for organised storage • Lifetime guarantee for peace of mind • Dual drive sizes cover wide range of applications Specifications: Brand: Premier Contents: 1/4"Sq Drive; 3, 4, 5, 6mm, 3/8"Sq Drive; 7, 8, 9, 10mm Drive: 1/4" & 3/8"Sq Maximum Length: 48mm Minimum Length: 38mm Nett Weight: 0.280kg Model No. AK65600