Replying to kinked rail plan...

what are the best dimensions for a kink rail, i was thinking like 6 foot flat to 8 foot kink, something around that lenght, but i don't know what kind of angle it should be sloped at? anybody have a suggestion and what type of metal i should uuse, i know lieks steel, but there is adifference between fence posts and then really good steel, so any suggestions would be appreciated thanks. (by the way i get the welding for free so that doesnt matter when calculating the cost)
don't do sleep and get 8 hours of drugs