Acrylic angen mirrors are lighter than stainless steel, making them easy to handle and install.In addition, the mirror backing plate is made of resin and is resistant to rust, so you can use it with confidence even along the coast.Recessed posts are common mounting posts for applications where concrete foundations can be installed in the installation location. Specifications: Mirror Surface: Methacrylic resin, Back: PE resin, PCV resin, Post: Diameter 1.4 x L 9.4 inches (34.0 x 2400 mm), 2.3 t., Electrostatic Powder Coating (Orange), Inner Lid Cap, Root Rebar, 1 Mounting Hardware, M8 x 20 Root Angle Bolts, Nuts 3 Pairs, A Mirror Size 15.7 inches (400 mm) Curvature Radius R 806 Anzen Mirror is used for preventing accidents in parking lots, warehouses, and for safety checks when entering or exiting garages. In Nuck, we produce angen mirrors using the knowledge cultivated on road reflectors on regular roads. Comes with a variety of mounting hardware to suit other applications. Although the foundation of the embedded posts is not specified, we recommend installing a concrete foundation with a sufficient depth for safety.