M-Wall ring bit system is a tool used to create M-Wall pipe-pile retaining walls. They can do duty as a load-bearing foundation, rather than just a wall that prevents ground masses from collapsing and they can also be made watertight and used with variety of interlocks. Solitary M-Wall system is a very cost-effective solution in situations where the risk of accidentally dropping, and possibly losing, the ring bit is not significant. In other cases, we recommend the integrated M-Wall system.