All .30 Caliber Nylon Coated Rods have a 12/28 Male Thread, an overall 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 shotguns by adding the SBA and SPL Adapters.