Thompson Center Bore Brush/Swab Set, 50-Caliber bronze bore brush and cotton bore swab set Standard 10-32 Threads for .50 caliber firearms T/C 7484 Bore Brush/Swab Set Thompson Center is dedicated to the hunter and outdoor enthusiast in providing products with the quality or high performance they expect Thompson Center is dedicated to the hunter and outdoor enthusiast in providing products with the quality or high performance they expect