Nobody here (in rural Washington) has an F5 fuse and nobody can tell the difference between F, G, GMA or any other letter they match be. My milling machine is still under warranty so I didn't want to trust any other 5 amp fuse with a different letter. Next day delivery, fits and seems to work well and there are 10 of them. The only reason not giving 5 stars is because I don't know if they will last. 2 weeks is still valid, I pay better attention to the depth of my cuts :-)