The (10-Pk) Fastenal General Purpose Flat Washer Thru-Hardened Yellow Zinc 1133820 is a high-quality hardware product designed for various industrial and fastening applications. Made of durable steel material, these flat washers are ideal for use in inch measurements. With the trusted brand of Fastenal and the specific manufacturer part number 1133820, these yellow zinc washers offer reliable performance and longevity for a range of hardware needs.