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 seamless interchangeability across all Redding Bushing Style Sizing Dies. These bushings come in .001 inches size increments, spanning from .185 inches to .368 inches and are suitable for calibers ranging from .17 to .338. Each bushing is clearly marked with its size I.D. for easy identification. By selecting the correct bushing, you can achieve the ideal neck tension to securely hold the bullet, providing consistent performance without the need for excessive resizing.