S&W 645 SER 45ACP NKL 10RD MAGAZINES&W 645, 4506, 4566 & 4586 Series Magazine .45 ACP - 10 round - Steel - Nickel plate - Easy loading - Rugged high carbon heat-treated body - High-quality, injection-molded polymer base & follower - Manufactured & assembled in the U.S.A.tion-molded polymer base & follower