The 7000 series round corner and 8000 series square corner molded plastic frames are designed for quality interior signage. All frames have a 1/2" outside depth, 1/8" thick walls and mounting holes for attaching to walls. The size of each frame is listed as an inside dimension and the inside radius on the round corner frames is 5/16". Each frame is designed to accommodate all sign material from 1/16" to 1/8" thick.