The toggle switch specifications are 10 A 277 V AC / 20 A 125 V AC. With a75°C max. temperature rating. It has a screw terminal type with a standard nut size of 15/32 – 32 inch. There are a total of 3 different rings around the threaded side. One is a nut that adjusts where it bottoms out in the hole you’re installing it in. The 2nd is the on/off plate. The 3rd is the nut that tightens against the mounting surface. The screw terminals also are very solid. Gardner Bender has 50 years of experience making professional electrical tools and supplies of consistently superior quality, so you can count on high-performance products at a fair price.