1This diamond coated core drill bit removes a complete circle from glass, tiles, marble, granite, ceramic or other materials and just needs water for lubrication. Works better with a electric drill (not included). 2Easy to use, start your hole diagonally, make a round trace and then hold drill straight. 3Good performance and long life. 4Excellent for making neat and accurate hole on glass and tile. 5This glass hole opener drill is made of sturdy material, which is more durable and sturdy.
