GREENER Four-Blade Serrated Eccentric Drill Bit for Tile and Concrete, Ultra-Hard Electric Drill Bit, High Hardness 10mm x 5

Four-blade serrated design for fast and efficient drilling

Impact-resistant, suitable for direct dry drilling without water

Enhanced hardness up to 93 HRC using high-temperature forged YG6A tungsten carbide steel for long-lasting durability

Sharp cutting edges with 60%-80% improved sharpness and drilling efficiency

Special serrated tooth and staggered tooth design for smooth chip removal and reduced wear

Enlarged spiral grooves for rapid debris evacuation, preventing bit overheating and damage

Head equipped with four large chip removal slots combining chip evacuation and heat dissipation for dry drilling performance