For places where a inchbreak glass inch cover is specified such as unsupervised areas. Accepted by many fire marshals, these versions of the world famous STI Stopper II are designed for areas where a inchbreak glass inch cover is specified. Each device consists of a red polycarbonate cover, mounting frame, a pane of single-strength clear glass easily replaced when broken, a glass-breaking bar and anchors for installation. Local fire marshal approval should be obtained prior to installation.