Simple & Efficient: This siding installation tools streamlines the entire process, making it simpler and effective. You can level and space your siding perfectly as you work up the wall, eliminating the need for complex layout calculations. Consider this tool your helper that effortlessly holds, supports, and clamps the cement-board siding. Applicable Size: Works with 5/16 inch cement siding. Can be adjusted at 1/4 inch increments for 4 inch to 8 inch siding reveals., Manufacturer: Jnchdghwa