The Hillman Group 180090 Acorn Pressed Nut, 5/16-Inch by 18-Inch, 100-Pack Product Description This acorn cap nut is a hex nut with an enclosed dome and it is partially internally threaded. The dome feature offers protection of exposed screw threads and a decorative appearance as a finishing fastener. The cap nut also protects from injury by covering exposed threads. From the Manufacturer This acorn cap nut is a hex nut with an enclosed dome and it is partially internally threaded. The dome feature offers protection of exposed screw threads and a decorative appearance as a finishing fastener. The cap nut also protects from injury by covering exposed threads. Features Can Be Used In Hobby And Furniture Projects, Fencing, Lawn Or Playground Equipment, For A Finished Appearance Preferred Offers Protection Of Threads And A Decorative Appearance As A Finishing Fastener Zinc Plated From The Brand Name: The Hillman Group USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.