The Made of high quality materials fuse base and Made of high quality materials cover have high temperature resistance and good insulation performance, which can effectively isolate current and prevent dangerous situations such as short circuits from occurring. And the nut with washer design aims to make the fuse and wire lugs fully contact with the fuse block, making it safer during high current use. This fuse block will come with a suitable 300A ANL fuse, which is gold plated design, with a transparent window to identify its status easier and quicker.. The fuse holder usually has a plug-in design, making it very convenient to install and replace fuses. What's more, it can be compatible with various sizes of ANL fuses. And the accompanying screws could securely fix it in place. This large capacity ANL fuse holder can work well under the systems whose amperage don't exceed 500A, suitable for automotive, car, truck, boat, etc. Note:Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Photo Color Material:Plastic + Metal Package Contents: 1 x Fuse holder 1 x Fuse (300A) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.