High quality 5pcs 150# Ultra-long diamond drilling bits 3x70mmx30mm diamond drilling grinding bit polishing bit
https://www.vogueparade.com/shopping/EN/1428/1/1005001983379945/high-quality-5pcs-150-ultra-long-diamond-drilling-bits-3x70mmx30mm-diamond-drilling-grinding-bit-polishing-bit//