Australia 's biggest venomous snake has produced a huge lethal 'shot ' for reptile wranglers on the NSW Central Coast . In an enormous yield , four-metre long king cobra Raja has delivered almost 500 milligrams of deadly toxin for veteran handler Billy Collett at Gosford 's Australian Reptile Park , north of Sydney . The toxin is enough to fill a shot glass and 40 times the amount of venom of a brown snake . 'It can kill a full grown elephant , ' Mr Collett said of the eight kilogram cobra . Scroll down for video . Australia 's biggest venomous snake has produced a huge lethal 'shot ' for reptile wranglers on the NSW Central Coast . The four-metre long king cobra Raja has delivered almost 500 milligrams of deadly toxin for veteran handler Billy Collett at Gosford 's Australian Reptile Park . Mr Collett has been milking snakes for almost 10 years but has never extracted venom from a king cobra . 'It 's a very dangerous yield , and they only give you about a third of what they 've got , ' Mr Collett added . 'They 've been known to hold on for minutes when they bite the first time . ' Its venom will be distributed between research institutes across the country . Mr Collett has been milking snakes for almost 10 years but has never extracted venom from a king cobra . ' I was very excited but I was very nervous , ' he said after the rare extraction on Thursday . 'He 's about as thick as my legs . ' The milking meant Mr Collett could safely measure and weigh the snake , who was last assessed four years ago . The snake delivered almost 500 milligrams which can fill a shot glass - 40 times the amount of venom of a brown snake . Its venom will be distributed between research institutes across the country . The milking meant Mr Collett could safely measure and weigh the snake , who was last assessed four years ago .
Raja , the king cobra , has delivered almost 500 milligrams of deadly toxin . The snake , which is at Australia 's Gosfordn Reptile Park , weighs 8kg . 'He 's about as thick as my legs , ' veteran handler Billy Collett said . Its venom will be distributed between research institutes across Gosford .