These are custom brass bushings we supply our automotive customer on a recurring blanket purchase order basis, with monthly releases based on their usage.  They are manufactured overseas in Taiwan and maintain +/-.009 tolerance on the outside and inside diameter, as well as the length.  The inside diameter is set at 0.500 inches, the outside diameter is at 0.688 inches, and the overall length is set at 0.875 inches.  Production runs at approximately 10,000 pieces at a time.