The original Velvac wide angle mirror head for use on walk in van, cutaway van, cab chassis and a variety of other applications Replaceable 1/8" glass on all mirrors - FSC on flat glass models and silvered glass with 21" radius of curvature on all convex models Outer gasket for edge shock protection 5/16" - 18" threaded mounting port for a clean, easy installation. Use with mounting clamp 704068 Viewing area is 32 square inches