13" Flex-Hones for large diameter cylinders. These hones are silicon carbide which is perfect for steel/iron applications. 
- The GBD Series Flex-Hone tool is designed for 13" diameter
- 34" Long Steel Shaft driveshaft
- Heavy-duty Flex-Hones are commonly used for block cylinders or liners, stationary diesel, oil and gas pipes, marine engine and many other applications
- The heavy duty tool is recommended for large diameter or high production applications