Manual Metal Arc Welding Electrodes Class M4manual Metal Arc Welding Electrodes Class M4,Manual Metal Arc Welding Electrodes. Dia 4Mm, Class M4 Type Of Coating Hea Vy. Drawing No.: Matl. & Spec.: Confirming Specn No. Irs-M-28/20, Code-E23.12Lr26 As Per Is 520 6-2013. [ Warranty Period: 12 Months After The Date Of Delivery ] ] Sse(C&W)/Tata, Ser Jharkhand 2000.00 Kg Sse(C&W)Bndm, Ser Odisha 3000.00 Kg