CIPA suction cup Marine Mirror attaches easily to a clean, smooth, non-porous surface to provide additional safety and overview. It does not require any tools to install, do not drill holes and leave no scratches on your boat. Once mounted, you can fine-tune the position of the mirror through the flexible arm. The mirror is 4 x 8 inch in size and contains convex glass for a wide viewing angle. When it comes to sailing, safety is just as important as having fun.