Platinum plated MAXI inline fuse holder for 4 AWG or 8 AWG cables. The top "RF Swirl" cover is removable with a small flathead screwdriver to reveal the MAXI fuse mounting hardware. MAXI fuse set screws require 3 mm Allen wrench. Power cable set screws require 4 mm Allen wrench. NOTE: Fuse and cable not included and sold separately.