In 2002, diamond developed a model tj7131u steering machine for Tianjin Xiali automobile company. The steering machine has been tested for 8000 km on mountain road and muddy road, and its performance is good.

Diamond developed New Rack DKM-C55C-37 for Race Car Use . The steering machine has been tested for 8000 km on mountain road and muddy road, and its performance is good.

Diamond developed C73 series of steering racks. The steering machine has been tested for 8000 km on mountain road and muddy road, and its performance is good.