Special Features:

Holes are drilled through around the perimeter; 6 x 0.258-0.261 inch diameter, 0.220 from the top and bottom edges, 1.830, 7.830 and 13.830 inches from the left edge; 3 x 0.258-0.261 diameter, 0.374 inch from right edge, 1.140, 7.140 and 13.140 up from bottom edge; 5 x 0.125 dia, 0.200 from left edge, 1.140, 4.140, 7.140, 10.140 and 13.140 up from bottom edge

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.