This 12ga Otis Technology 3 Inch bore mop feature a densely packed, highly absorbent, cotton mop that is ideal for applying your favorite Shooterinch(TM)s Choice gun solvent or lubricant. The brass stem will not damage your barrel and is equipped with standard 5/16-27 threads. Cleans: 12ga Length: 3 Inch Thread: 5/16-27 Includes: 1 Cotton Bore Mop Ideal for use with Otis Shotgun Rod with 5/16-27 threads Made in the USA