About the Products: Made of high-quality carbon steel, which is corrosion-resistant, rust proof, has high hardness, is not easy to break, and has a longer service life Specifications: Product Name: Socket Cap Screws Material: Carbon Steel Color: Black Type: Flat Head Size: 1/4-20 x 2 Inch Package Include: 30 Pack Socket Cap Bolts Screws 1 Pack Hex Key Wrench Warmly Note: 1.)The colors may have differences in the different displays, please understand. 2). Please allow 1-2mm error due to manual measurement, please make sure you do not mind before you bid.