This siding installation tools work with 3/8 inch cement siding. [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. [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 [Efficient] This gauge tools possible for installing fiber cement siding to be a one person job, and help you siding installation work very easily and efficiently, Manufacturer: PokFhgur