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

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

Three-in-one size design: 20mm/35mm/50mm are available to meet different hole diameter requirements achieve precise hole expansion and significantly improve work efficiency Durable material: High-density diamond particle coating used the cutting...


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