All .30 Caliber Nylon Coated Rods have 12/28 Male Threads, an outside diameter of approximately .265 inches, and a dual track ball bearing handle. The Nylon will not peel or pick up abrasives of any kind. All rods are single piece rods unless otherwise stated. We use male threads because they allow for a coating 7-9 times thicker than female threaded rods. The connection between the male thread and rod attachment is much stronger, as well. .30 Caliber rods fit all calibers from .27 on up to .50 caliber. They may also be used on shotg's by adding the SBA adapter and SPL patch loop.