I think Tai made,having the hole within the grip area.Also,think 85 Raider bars were mild steel,where as 86 were supposedly cro-mo(28 X 8 1/2).If your desperate to find out what material they're made of,an engineering company could do a simple hardness test on them(where they press a tiny ball bearing into the metal-how far it goes into the metal for a given pressure will determine the steel type) or just see if it's seamless......cro-mo should be !!