The AndyMark 6mm D to 0.376in. Hex Adapter facilitates the integration of 6 mm D shafts and NeveRest motors with a variety of hex products, including wheels, hubs, sprockets, and gears. This adapter allows for the stacking of multiple units on a single shaft or direct use with an end-stop screw on a motor's output shaft. The improved design features a set screw for secure placement along the shaft and end stops to maintain the position of 1-inch wide components.