CIPA's Suction Cup Marine Mirror easily attaches to any clean, smooth, non-porous surface to provide added safety and situational awareness. It requires no tools to install, no holes to drill, and it wont scratch your boat. Once mounted, the flexible arm lets you fine-tune the mirrors placement. The mirror head measures at 4 x 8 inches, and contains convex safety glass for wide angle viewing. When it comes to boating, being safe is just as important as having fun.