High quality bore mop makes fast work of tough bore cleaning chores. Durable all-cotton material is bonded to a non-embedding brass core. Can be soaked with solvent or used as a swab for paste cleaners. Features 5-40 tpi male thread; fits the .177 Dewey Coated Rods that we carry also. These mops will fit the PY-A-1037 Dewey rod.