BGTEC Dry Diamond Drill Bits Set-15pcs 6mm Hole Saw+5pcs 6mm Carbide Drill for Gtanite, Marble. Masonry, Concrete, Porcelain

Round shank dry drill: Diameter - shank diameter: 6MM-5.5MM. 65MM overall length, 8MM grit height Diamond grit #50/60. suitable for hand drill (plug-in), bench drill. Round shank carbide drill bit: 6MM diameter, 68MM total length, YG6X alloy Precautions for use. 1, wet and dry use; 2, Do not use impact or hammer mode; 3, Use the suction cup locator to position the hole accurately, or place the drill at a 45 degree angle to drill until the drill starts to penetrate the material, then lift the drill to a vertical position and continue

• 【Size 1】Diameter 6mm 1/4 Inch,diamond length 8mm,Round shank
• 【Size 2】Total 10 pieces, 5 pcs dry diamond drill bits (1/4" 6mm), round shank and 5pcs Carbide Drill bit (1/4" 6mm).
• 【Vacuum Brazed technology】 Higher efficiency, faster working speed, longer service life.
• 【Note】Used for hand drill and bench drill,Hand drill at 2000-5000RPM, the slower the shorter the life.
• 【Compact design】Top spiral groove for good heat dissipation