PacTool International SA90376.LP Gecko Gauge Siding Gauges for 7/16" LP Siding - 1 Set per Package For use with 7/16" LP Siding Adjustable at 1/4" increments for 5" to 8" plus 8-1/2" and 6-7/16" LP siding reveals Gauges and supports siding for one-person installation with virtually no layout time Friction-Cam mechanism for incredible holding power Won't scratch or mar pre-painted siding