procurement of special electrodes , item description , steel jointing electrode size 3 . 15mm category a-4 for detailed technical specification please refer to schedule of requirement of nit , steel jointing electrodesize 4mm category a-4 for detailed technical specification please refer to schedule of requirement of nit , steel jointing electrode size 5mm category a-4 for detailed technical specification please refer to schedule of requirement of nit , low hydrogen jointing electrode size 4mm category a-1 for detailed technical specification please refer to schedule of requirement of nit , low hydrogen jointing electrode size 5mm category a-1 for detailed technical specification please refer to schedule of requirement of nit , cutting & gouging electrode size 4mm category eg-1 ( gouging ) for detailed technical specification please refer to schedule of requirement of nit , cutting & gouging electrode size 5mm category eg-1 ( gouging ) for detailed technical specification please refer to schedule of requirement of nit , hard facing electrode size 4mm category c-6 for detailed technical specification please refer to schedule of requirement of nit , hard facing electrode size 5mm category c-6 for detailed technical specification please refer to schedule of requirement of nit , cast iron electrode size 4mm , category d-2 for detailed technical specification please refer to schedule of requirement of nit , cast iron electrode size: 4mm category d-1 for detailed technical specification please refer to schedule of requirement of nit , steel jointing electrode size 4mm category a-2 for detailed technical specification please refer to schedule of requirement of nit , steel jointing electrode size 4mm category a-3 for detailed technical specification please refer to schedule of requirement of nit