This siding installation tools work with 3/8 inch thick fiber cement siding. [Adjustable] Siding gauge tools is adjustable at 1/4-inch increments for 4 to 8-inch siding reveals, Accommodate siding widths from 4Inch to 8.25Inch and can support full 12-foot cement-board siding lengths [Material] The main structure of this product is Produced with heavy-duty plastic ,the locking grip is made material, avoiding to scratch or mar pre-painted siding. [Efficient] This gauge tools make it possible for installing fiber cement siding to be a one person job, and help you siding installation work very easily and efficiently Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Color:Green Material:plastic Package Contents: 2 * siding mounting block gauges