4 x 1/4"D socket bits: 3, 4, 5, 6mm. Length: 37mm. 4 x 3/8"D socket bits: 7, 8, 9, 10mm. Length: 48mm. Socket manufactured from chrome vanadium, bits from S2 steel. Specially designed profile to "bite" into damaged Hex fixings. Supplied on metal rail for easy storage. Extractor set for damaged Torx fasteners available - please see Laser Part No. 8053.