2Pcs Diamond Step Drill Bit, 20mm 35mm 50mm Diamond Core Drill Bit Diamond Hole Opener Puncher Round Hole Cone Grinder Bit for Marble Stone Tile Concrete Granite Quartzite, M10 Thread. Multi-functional application: It integrates the functions of drilling, hole expansion, chamfering, and polishing existing holes.
TOPBRAS ABRASIVOS VINHEDO Abrasivos de Alta Performance Experiência, Competência e Qualidade