Ridgid dies for use in the following die heads: 811A, 815A, 816, 817, 856, 911 and 913. The ‘Gold’ dies are titanium nitride coated making them much harder wearing than the standard alloy dies. This coating makes the dies ideal for threading stainless or other hard materials. As with all dies liberal threading lubrication is essential to get maximum performance and life out of your dies.