General description Sealey Metric Socket Set is a 13-piece set designed for professional use, featuring a 1/4'' square drive lock-on mechanism. Manufactured from hardened and tempered high-grade Chrome Vanadium 6142 steel, this set is built for durability and performance. Technical specifications Material: Chrome Vanadium 6142 steel Finish: Fully polished mirror finish Contents: 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14mm Usage Specially machined flutes in the walls of the socket allow use on up to 85% rounded fasteners Knurled ring provides extra grip, even with oily fingers Prevents damage to worn or rusted fixings Other information Supplied on socket rail Lifetime guarantee*