Features: This fuses relays box is pre-wired design, completing half of the connection work, makes the entire connection process faster and time-saving. This fuses and relays box can maximumly hold 4 relays and 12 fuses at the same time, making multiple relays in one box, keep your circuit neat and tidy. The front mounting design can safely install the relays fuses box anywhere. The waterproof fuses relays block is designed to provide a reliable and safe environment for the use of equipment and keep the connection system clean. It is applicable to car, trucks, ships. This relays box 12v automotive will be equipped with 4 pieces of 4 pin 40A relays, provide the highest rating to make its application wider and safe. This auto fuses block will also come with 12 pieces of fuses, which includes 3x10A, 3x20A, 3x25A, and 3x30A blade fuses, can meet a wide range of using requirements. Specifications: Component:Plastic Size:Approx.16.3x7cm/6.45x2.77inch Relays Type: 40A Relays Way: 4 Way Voltages: 12V/24V Cover Material：Plastic Base Material: Flame Retardant Nylon Material Product Shape: Insert Type Package Includes: 1 Set 12 Circuit Relays Fuses Holder note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.