Touei has been known for its innovation with many designs in their tooling, the rigid 4" steel backer pad is no exception.
The Touei Steel Backer is designed as one piece, including the threading
The Touei Steel Backer bad is extremely thin giving the fabricator finesse
The Touei Steel Backer capable of rotating in almost a perfect circle. The cheaper backer pad with misalignment can’t rotate in a perfect circle, and can cause damage to the machine.
The Touei Steel Backer Pad is approximately 20% lighter than other backing pads.