Pack of 5/8" Expandable Locking Nylon Plastic Wiring Hole Grommets Hole Diameter: 5/8" Finish Edge (Top): 3/4" 12 Pack Panel Thickness: 1/32" - 1/4" Durometer: 80D Extra Hard These Hole Cover Bushings can be used for: Panels, Desktops, Workbenches, or any other material where wiring needs to pass through. Plus these make everything look clean, as opposed to just drilling a hole. The width listed is the actual size of the cylinder which will fit into the hole. The top of the grommet has a small flange which covers outside of hole. These lock in to place. The center hole has flaps that flex to hold and protect multiple sizes of wire, cable, and cords while also keeping out dust and debris. Snap these grommets into place and their wings expand against the sides of the hole to lock them in position. Turns rough-edged and uneven holes into smooth holes. Made of plastic, these grommets are chemical resistant, and all have an extra-hard rating to withstand high levels of impact. These can be used outdoors and won't dry out and become brittle when exposed to UV rays. Use drop down box to select pack size Ships Fast and Free Made in USA