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 interchange seamlessly with all Redding Bushing Style Sizing Dies. These bushings come in .001 inches size increments, spanning from .185 inches to .368 inches and accommodate calibers from .17 to .338. Each bushing is clearly marked with its size I.D., making selection straightforward. By choosing the correct bushing, you can provide just the right amount of neck tension to securely hold the bullet, preventing excessive resizing and ensuring consistent, high-performance ammunition.