High quality: Made from High-quality chrome vanadium steel. Durable: Quenching heat treatment to the whole makes the hardness high, the product is durable. Beautiful: The surface of the product has been colorful plated so that it is rust proof and beautiful. Easy to use: Magnetic design, quick release Widely used: The product is applied to repair, car modification, vehical transmission, wrench socket transformation etc. Specification: Material: chrome vanadium steel Size: Approx.70*50*18mm/2.76*1.97*0.71' Shank: 1/4'(6.35mm), 5/16'(7.93mm), 3/8'(9.53mm), 7/16'(11.11mm), 1/2'(12.7mm) Color: Multi Package Includes: 5 Pieces Hex Bit Socket Set : As different computers display colors differently, the color of the actual item may vary slightly from the above images. There is 2-3% difference according to manual measurement. Please check the measurement chart carefully before you buy the item.