15 PCS Diamond Drill Bit,Glass Hole Saw Set,Hollow Core Drill Bit Set for Ceramic Tile,Marble,Ceramics,Porcelain,6-50mm

Package 15pcs x Diamond Drill Bit 15 Different Size · 6mm,8mm,10mm,12mm,14mm · 16mm,18mm,20mm,22mm,25mm · 26mm,28mm,30mm,40mm,50mm · Length: 2" Features Large clearance hole allow for water and escape of chips. Perfect for drilling glass,tile,ceramic tile,porcelain,stone,wood,marble. Attention Start hole at an angle 45° slowly,make a round trace then hold drill straight. Water is required for lubrication when drilling. Low drill pressure and increased use of water will protect and storage the drill bit better.