4 adjectives to describe peephole

Several small windows which looked upon the court were barred, and there was a door with a grated peephole, where Angela fancied that she caught the glint of eyes as the lantern swung in a light breeze.

When they had finished, Victor elbowed them out of his way and thrust back the slide of a narrow horizontal peephole, through which he reconnoitred.

When they had finished, Victor elbowed them out of his way and thrust back the slide of a narrow horizontal peephole, through which he reconnoitred.

Even these stumps, however, made it difficult to get an uninterrupted view of the Tamburo, and I had to go some miles along the trenches, gazing through numerous peepholes, before I reached a point from which I could satisfy myself that our bombardments had been effective and that the reported new works were indeed real.

4 adjectives to describe  peephole