C4-K1.8RA-680 C4-K1.8RA-680M C4-K1.8RA-6R8 C4-K1.8RA-6R8N C4-K1.8RA-820 C4-K1.8RA-820M C4-K1.8RA-8R2 C4-K1.8RA-8R2N C4-K1.8RR12W45202EA C4-K2.5-100