Metra WM-FH14 universal mini ANL fuse holder with 40 amp fuse. This fuse holder is used to protect your electrical devices from short circuits or amperage spikes. We at Metra always strive to listen to our customers. You have told us to do a better job at telling the Metra story. For over 70 years, Metra has maintained its cutting edge by paying attention to our marketplace and innovating products to fit the needs of the installer. We are the "Installer's Choice" because we are installers. We design our products to be easy to use and easy on the eyes. If you can see a Metra product, then we haven't done our job.