Redding Neck Sizing Bushings are offered in two styles, both with the same external dimensions of 1/2 inches O.D. x 3/8 inches long, ensuring full interchangeability with all Redding Bushing Style Sizing Dies. Comes in precise .001 inches size increments, these bushings cover a range from .185 inches to .368 inches and are compatible with all calibers from .17 to .338. Each bushing is clearly marked with its size I.D. for easy selection. By choosing the correct bushing, you can achieve the optimal amount of neck tension, securely holding the bullet without excessive resizing, resulting in consistent and reliable performance.