Features:Chrome Vanadium steel Total Drive sockets, hardened and heat treated for strength Half chrome/satin finish with knurled ring for corrosion resistance and extra grip - even with oily fingers All sockets are equivalent to Metric hex and bi-hex sockets with many being also equivalent to Imperial hex, Imperial bi-hex and TRX-Star* sockets Rail mounted for ease of storage and socket selection Specifications:Model No: AK69813DDepth: DeepDrive: 1/4"Sq Quantity of Sockets: 13Contents: 4, 4, Weight: 1.0141264052 Pounds, Manufacturer: Sealey