Kincrome's Hex Socket Set 1/2" Drive Imperial features 8 100mm 1/2" square pieces in sizes 3/16, 7/32, 1/4, 5/16, 3/8,1/2, 9/16, 5/8". The parts are manufactured from heavy duty chrome Vanadium Steel and supplied on a clip rail for functional storage. The Driving Bit is crafted from Silicone Alloy Steel (S2).