EZi-Gauge is designed to increase installation speed of popular fiber cement or engineered wood lap panels assisting in meeting manufacturers specifications.  When high nailing can create loose panels and low nailing reveals nail heads needing caulk the EZi-Gauge will easily give you the good nail placement while reducing reliance on acute eye-to-hand coordination.  The gauge pin gives the installer a degree of variability in gun angle while still landing in the fastener zone.  In addition the pin is spring loaded to allow normal use of the nailer without taking the Ezi-Gauge off.  Allowing you to face nail under windows, top rows, and gable end points.  It is anodized and comes with a hex key for the stainless steel set screws.