coarse emery grinding burr grit #40/60 grinding bits shank 4mm ultra-long 6mm/7mm diamond abrasive bits peeling trimming bits
https://www.vogueparade.com/shopping/EN/1428/1/33009293943/coarse-emery-grinding-burr-grit-4060-grinding-bits-shank-4mm-ultra-long-6mm7mm-diamond-abrasive-bits-peeling-trimming-bits//