Sigma Machine Tools manufactures Bridge Type Double Head Automatic Polishing Machine. Sigma Machine Tools supplies wide range of marble and granite stone cutting and polishing machines and its accessories. Bridge Type Double Head Automatic Polishing Machine can be used to polish surface of marble, granite and other stones of any thickness. Bridge Type Double Head Automatic Polishing Machine comes with 2 oscillating heads with 2 or 4 polishing bricks. It is available in a number of sizes and variation depending on the requirements. This machine can also be customizing according to the requirement of the customers. It is available in two different models.