Achei um bom material, bom custo benefício, recomendo a todos obrigado
Main Features ● This diamond-coated drill bit removes a complete circle from glass, tile, marble, and ceramic, but it can't be used for granite and metal. ● It only needs water to lubricate. ● Always use lubricant (water) or the diamond bit will burn. ● Can be used with standard electric drills. ● Start your hole along the diagonal, make a round mark, and drill directly.