Redding Neck Sizing Bushings are offered in two styles, both with identical external dimensions of 1/2 inches O.D. x 3/8 inches long, ensuring seamless interchangeability with all Redding Bushing Style Sizing Dies. These bushings are available in .001 inches size increments, spanning from .185 inches to .368 inches and cover calibers from .17 to .338. Each bushing is clearly marked with its size I.D. for quick identification. By selecting the appropriate bushing, you can achieve the perfect amount of neck tension, ensuring the bullet is securely held without excessive resizing, leading to consistent and reliable ammunition performance.