Prime-Line 9059581 Hex Bolts, 3/8 In.-16 X 1 In., Grade 304 Stainless, 25 Pack Hex bolts are one of the most common fasteners and can be used in a wide variety of applications. The 6 sided head makes them easy to install using a standard wrench or socket tool. Nuts and washers are not included, so will need to be purchased separately. Washers help to evenly distribute the load and should always be used under the bolt head and under the nut (just under the bolt head if installing into a threaded hole). Flat washers and finished/standard hex nuts work great for most applications, though if the bolt may be subject to excessive vibration, it is recommended that lock washers and lock nuts be used instead. Size: 3/8 inch-16 X 1 inch One of the most common and versatile fasteners Designed for use with a nut or a threaded hole of the same diameter and thread size Features a 6 sided head and can be fastened using a wrench or socket tool Nuts and washers not included