Lock on Gutter Guards,Metal Lock in Gutter Guards Lock on gutter guard is made of .028" expanded galvanized steel sheet. This makes the guard durable enough and has superior strength. So it can maintain its shape from month to month and is ideal for standing up great heavy debris and snow loads. The gutter guard is covered with a baked powder coating system that is not rust and anti corrosion. Installation of Gutter Guard Do not need to disturb your shingles because of the spring action. It is easy to install. Back edge slides under first row of shingles, and front edge locks on the front lip of the gutter. So it is very convenient if you want to change your gutters or give them a complete cleaning. Specifications of Gutter Guard Material: .028" steel. Color: black. Size: 5" × 48", 6" × 48", and special order 7", 8" width. Package: 5 pieces or 25 pieces per box.