Item: BGTEC Diamond Core Drill Bit Set Hole Saw Kit with Lightning Teeth for Ceramic Tile Porcelain Pacage: Aluminum Case or Oxford Cloth Bag Connection: M14 Specification: Drill Bit: Dia 6/8/10/20/35/50/68/100mm: Diamond height 10mm, workable length 35mm, total length 60mm, grit #35/40 Drilling Finger Bit: Dia 25mm, diamond height 5mm(for drilling part), 30mm(for finger bit part), total length 60mm Chamfer Bit: Dia 50mm, work length 46mm, total length 55mm, grit #80 Dia 20mm, diamond height 20mm(for chamfer bit part), 30mm(for finger bit part), total length 60mm Hex Adapter: M14 male thread, 3/8" hexagon shank, shank length 28mm, total length 53mm Application: 1. For Porcelain Tile, Ceramic Tile, Marble, Granite, etc; 2. Dry or wet use. Feature: 1. Internal wax cooling: Accelerate heat dissipation and avoid burning 2. 4mm wide lightning teeth design: Facilitates debris and heat dissipation, better performance 3. Versatility: Drilling & Enlarging & Grinding & Beveling 4. Vacuum brazing technology: Provides longer working life. Note: Do not use shock mode!