Universal Fit: Suitable for most Automotive Marine Car Audio Video Alarm Amplifier and so on. Use for battery and alternator connections. Feature: Protect the safety of the mat parts in the circuit, when a short circuit occurs in the circuit when there is a current, timely switch the current to protect the parts in the circuit. Product Characteristics: Made of plastic and metal material, it's Durable with long time using. How to Install: Direct replace and install without special tools, convenient to use. Colour:black Material:plastic+metal type:40A Package Contents: 6 x Fuse Holder 6 x Fuse 12 x Tube Terminal 12 x Pre Cut Heat Shrink Sleeving 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.