Redding Neck Sizing Bushings are available in two styles, both featuring identical external dimensions of 1/2 inches O.D. x 3/8 inches long, ensuring compatibility and easy interchangeability across all Redding Bushing Style Sizing Dies. These bushings come in .001 inches size increments, spanning from .185 inches to .368 inches and cover all calibers from .17 to .338. Each bushing is clearly marked with its size I.D. for quick identification. By selecting the correct bushing, you can achieve the ideal amount of neck tension, ensuring a secure bullet hold without excessive resizing, leading to more consistent and reliable performance in your reloading process.