BGTEC Diamond Drill Bit 1/2pcs 28mm Ceramie Granite Marble Brick Concrete Vacuum Brazed Core Bit Round Shank

Item: BGTEC Vacuum Brazed Diamond Drill Bit Round Shank for Granite Marble Brick Concrete  Quantity:  1pc,2pcs Grit: #40/45   Specification: Diameter 28mm, diamond height 10mm, working length 30mm, total length 65mm, round shank. Application: For drilling granite & marble, brick, concrete, porcelain tile, ceramic tile Feature:  1. U-slots design: four U-slots in the top of the drill head to drain the heat; 2. High concentration of diamonds in tight rows: sharper drill bit for faster and more efficient drilling; 3. Advanced brazing technology: Longer life span and less susceptible to chipping. Note: 1.Dry or wet use, suitable for Electric hand drill or Bench drill.2.Recommended RPM: 2000-5000. The faster the better, the slower the shorter the life span.3.Do not use impact or hammer mode.