This Sealey Lock-On Socket Set is manufactured from hardened and tempered high-grade Chrome Vanadium 6142 steel with a fully polished mirror finish for resistance to corrosion. The sockets feature specially machined flutes in the walls, enabling use on up to 85% rounded fasteners. This design provides added strength and prevents damage to worn or rusted fixings. The set includes a knurled ring for extra grip with oily fingers. Contents: 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14mm. Supplied on a socket rail. Lifetime guarantee*. Model No. AK2746. Weight: 0.25kg.