Here's a modern descendant of the vintage LittleFuse assembly you'll find on '50s-'60s Fender amps. Tough thermoplastic body. Ribbed conical cap, super smooth 'bayonet' insertion and removal action. Two sturdy tinned copper alloy solder lugs. Accepts standard USA "3AG" 1&1/4" long X 1/4" diameter glass fuses with nickel plated brass ends. Complete with fastening nut and rubber washer. Mounts through a 1/2" hole in your chassis.