Malco Fiber Cement Siding Overlap Gauge is designed with strong, one-piece tempered spring steel construction to ensure durability and precision. Its precision-ground tip s a secure grip behind the siding plank, making it compatible with 5/16" (7.94mm) fiber cement siding. This tool allows for easy, one-person application, utilizing two gauges that support the entire length of the plank and accurately gauge a standard 1-1/4" (31.75mm) overlap in a single step. The design requires no adjustments or markings, and it will not damage the finish of prepainted siding, making it both efficient and safe for your siding projects. The package includes two steel gauges in a clamshell packaging for convenience. Model Number: FCG2