5/16" Short Spring Nut - Aluminum Strut Channel Nuts are used for making connections between channel and other components. Short Spring Channel Nuts are to be used with 13/16" x 1" deep Strut Channel. Channel Nuts with springs have indented ridges that fit perfectly into the inside of your channel and provide resistance against the channel to minimize slipping during installation. Use with Like Metal Hardware for best results. Aluminum doesn’t rust but it does corrode. Aluminum is a reliable choice for outside structures and may be able to last in the elements for a few years.