This heavy-duty snow guard is used for corrugated, slate, flat and asphalt shingled roofs. The Pro 100 has been tested to withstand a 300-pound point load at any location when applied to the gusset side of the shoe. The superior design of the Pro 100 includes a 1-inch gusset that reinforces the shoe, which makes this snow guard 5 times stronger than traditional residential snow guards. This style snow guard provides fast installation and is ideal for existing or new construction applications with asphalt shingled roofs. Simply insert the slotted bar under the slate or shingle, engage a nail with one of the conveniently placed slots and pull to fully secure the bar.