... quality,superior performance and competitive price Inserts,Ferrule,3 pieces for nylon tubing: • Features:3,4,7 pieces for tube is fitted to ... (insert), cutting ring(ferrule), nut,connector. • Materials:Iron,brass. • Fit size:¢5,¢6,¢8,¢10,¢12,¢14,¢15,¢16 nylon tube ...