Budget Diamond Electro Plated Glass Hole Core Bit [Diameter:25mm]

Suitable for porcelain, glass, marble, ceramic, rock and granite -Start slowly, 45 degree angle. -Go vertical after you make an initial mark. - Let the tool work it self - take your time. - Cold water as a coolant is a good idea. The diameter of the shank which the sizes from 6mm to 18mm is 6mm and the length of the shank is 50mm. -The diameter of the shank which the sizes from 20mm to 35mm is 8mm and the length of the shank is 55mm -The diameter of the shank which the sizes from 38mm to 100mm is 10mm and the length of the shank is 55mm. Many sizes available, up to 125mm !.