#8/32 FS-600 Mini Nut w/Regular Spring - Electro-Galvanized Is a channel nut that fits FS-600 Channel and other 13/16" x 13/16" Strut Channel. These Strut Channel Nuts grab onto the lips of the strut channel and use springs to guide connection and keep the Channel Nut in place. Channel nuts should be like Metal Hardware. Electro-Galvanized Steel should be used in interior applications where conditions are dry, and humidity is low.