The manfrotto mh057m0 rc4 magnesium ball head is a high performance head with a swathe of impressive features including a 90deg 105deg portrait angle selector the rc4 quick release system with spirit level a 15kg maximum load and the use of magnesium which allows for a sturdy design without making the head excessively heavy the manfrotto mh057m0 rc4 is ideal for use with such tripods as the manfrotto 057 carbon fibre series