Redding Neck Sizing Bushings come in two styles, both featuring identical external dimensions of 1/2 inches O.D. x 3/8 inches long, ensuring full interchangeability with all Redding Bushing Style Sizing Dies. These bushings are offered in .001 inches size increments, ranging from .185 inches to .368 inches, covering all calibers from .17 to .338. Each bushing is clearly marked with its size I.D., making it easy-to select the right one. By choosing the correct bushing, you can achieve the optimal amount of neck tension to securely hold the bullet without excessive resizing, ensuring reliable, high-performance ammunition.