Rocket Propelled Grenades or RPG’s are very dangerous devices which can cause incredible damage and injury if they hit a ship or building and the RPG explodes. RPGs contain an explosive charge that on detonation can penetrate more than 300mm thickness of steel.
Proper (military grade) RPG fences are specialised in their design and strength and have traditionally been used for military applications, for example to protect tanks and armoured vehicles.
There are two types of fence, one designed to pre-detonate an RPG (where you can be at a safe distance from the blast) and the other designed to short circuit the RPG to remove the main threat of the explosive charge. Buildings and vessels typcally need the second type which can help defeat the RPG and prevent explosion.