For square spectacle plate / round spectacle plate outer diameter 175 mm
Also called spectacle stone cover.
Galvalume steel sheet 1mm thick, 300 degree heat resistant paint.
The square type is 435 mm x 435 mm.
The round shape has a diameter of 435 mm.
Both holes have a diameter of 185 mm, so it is possible to pass through a 175 mm double chimney.
Can be used as a chimney cover for horizontal ceilings and vertical walls.