The 216-221 is an insulated ferrule sleeve designed to terminate 0.5 mm² (20 AWG) stranded conductors. This electro-tin plated component features a white insulating collar and has an overall length of 12 mm with a sleeve length of 6 mm. It requires a wire strip length of 7 mm for proper installation. Using this ferrule ensures a perfect gas-tight crimp, providing a connection that is both electrically and mechanically reliable in terminal block applications.