It depends on the diameter of the tube as to how long they will need to be. we used to get tube that was roughly 20mm -25mm. this was cut into lengths of about eight inches. we used to cut them on an angle[about 45 degrees]then you dont have to bash the ends flat to drill them for the split ring. try making one at about 8 inches, weigh it, if its too heavy shorten it till you find the weight your after[we used to make them 16-20 oz] for whitby, Or longer if they arent heavy enough. as for hook size, massive trebles cod have gobs like coal buckets, Hope this helps,Bry