This siding installation tools work with 38 inch cement siding.[Adjustable] Siding gauge tools is adjustable at 14-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 possible for installing fiber cement siding to be a one person job, and help you siding installation work very easily and efficientlyPlease note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you!Color:GreenMaterial:plasticPackage Contents:2 * siding mounting block gaugesOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +- 1-3cm.