Product Details:

90 Degree Viewing
Corner Mounting for Two-Way Intersections
Ceiling Mount Only
Hardboard Back

Constructed of High Quality Durable 1/8" Thick Acrylic.
Excellent visibility is attained from a high quality mirror coated interior surface.  

Quarter Dome 90° Mirror can be placed strategically at "L" shaped hallways or intersections to eliminate blind spots.

Ships complete with easy to install mounting instructions.

Covers Area up to 200 sq. ft