Overall this fuse holder is easy to use but not idiot proof. The stack of washers makes it a little unclear what order to install the eyelets and fuse in. After a couple of minutes of messing around it becomes clear what the intent was. The black base, washers etc work well enough but the clear cover has a couple of issues with it. It doesn't secure well enough with the tab locks for my tastes. So I secured the cover with a zip tie so it won't come off and get lost. The other issue is the wire openings don't even attempt to keep dirt & debris from entering the fuse holder. Some foam rubber around the wire will seal the opening and accommodate smaller wire gauge than 1/0 but is not included. It may be possible to connect 2 4 gauge wires on the same end but keep in mind the unit was designed for 1 each of 1/0 gauge wire per end so it may require the cover opening to be filed. This unit isn't perfect but can be fairly easily modified with a file and some foam rubber to seal the wire openings. Don't forget a zip tie to hold the cover on securely for under the hood installation. All fairly minor mods that make this a reliable and inexpensive unit.
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