The product is a box of 25 F5/16-18 5/8 unslotted hex washer type bolts, made of steel with a thread size of 18. The bolts have a head style of hex flange and a finish of zinc clear. They are 1-1/4 inches in length and designed for use as flange bolts or grain bin bolts. The drive type is hex, making them easy to tighten and secure with a wrench or nut driver. These bolts are ideal for various industrial and business applications requiring strong and durable fasteners.