Easy To Install On The Wall. It Can Carry The 4.5 K.G. Co2 type Fire Extinguisher Good. L-Shaped With Silver Colour. It is a Strong Product. It Is Long Life Product. The wall hook is typically made of metal, such as steel or aluminum, to provide strength and durability. The hook size will depend on the size of the CO2 fire extinguisher it is designed to hold. Common sizes include 2kg, 3kg, and 5kg. The hook is typically L-shaped with a curved end to hold the base of the fire extinguisher, and a straight end that attaches to the wall. The hook may be painted red to match the color of the fire extinguisher and indicate its location in case of an emergency. The hook will typically have two or more holes for mounting onto a wall using screws or other hardware.