Review on InstallGear 100A 4/8 AWG AGU Fuse Holder Distribution Block - 4 Gauge In To (2) 8 Gauge Out For Auto, RV, Motorcycle & Boat by David Hashman

InstallGear is identical to the ZOOKOTO chinese brand, right down to the screws used to hold the individual pieces of the fuse holder together. Yes, screws assemble these fuse holders, and not to the base. to each other. There is not enough positive contact surface between the individual components such as what you would get with welding or soldering them together to prevent high resistance under high load. This thing advertised 60 to 100A rating but any more than 40 amps constant would cause the fuses to burn. We burnt two fuses up in 2 minutes discovering this for the first time. If you need it for short circuit protection on something that pulls 10 to 20 amps, I'm sure you'll be fine. But if you expect to pull 80 amps on these things, you're likely to have a fire from the fuse holder overheating.