Special Features:

Outside edges 0.078 to 0.081 in. Thk, to 0.156 to 0.157 in. Width; mtd by 4, 0.067 in. Dia, holes cbored 0.106 in. Diameter to a dp of 0.047 in.

Properties:

A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.