Introducing Emerald Green Shifter Shaft Extensions, available in 6, 9, 12, and 18-inch lengths. These extensions feature a stunning emerald green finish and a thread-on design with a 1/2 inch 1 13 Unified National Coarse (UNC) thread. The thread is 1 inch long, and the diameter of the shaft is 3/4 inches. Each extension is sold individually and fits perfectly on the Peterbilt Shifter Shaft (UP21740). Enhance your shifting experience with these practical and stylish shaft extensions.