3'' inch - 80mm diamond grinding discs, polishing pads or other tools.
3'' 50# grit wet polishing pad for concrete | install in NCCTEC L357,M3,L4480,L4580,L4680 floor polisher .
stock only has 50# grit special for wet polishing concrete floor surface. if you want other grit, please tell us.
it is used for doing polished concrete (mirror concrete).