Redding Neck Sizing Bushings are available in two styles, both with identical external dimensions of 1/2 inches O.D. x 3/8 inches long, ensuring they easily interchange with all Redding Bushing Style Sizing Dies. These bushings come in .001 inches size increments, ranging from .185 inches to .368 inches, covering calibers from .17 to .338. Each bushing is clearly marked with its size I.D., allowing for quick and accurate selection. By choosing the right bushing, you can achieve the perfect amount of neck tension to securely hold the bullet without the need for excessive resizing, ensuring optimal performance and consistency in your reloading process.