Peel & Stick vault key-hole signal buttons are fast and easy to apply. Color coded with adhesive back, these rubber signal dots remove easily from the adhesive pad and can be stuck on the key lock itself or directly on the safe deposit box door. Colors denote category: RED - officially sealed by court or bank order, BLUE - rent overdue, WHITE - box for rent, BLACK - death, GREEN - special uses, ORANGE - more than one person present to open box. One universal size 1/2 inch head. Sold 32 signals of one color per sheet.