Lichtgitter grating

Pressure-locked gratings - standard programme. Bearing bars: 30 x 2 mm, bearing bar pitch: approx. 30 x 30 mm. http://www.lichtgitter.de/elocal/pstandard.html The inventor - ipt is an iPart which includes all available sizes. I always wonder about the discrepancy between the number of Downloads and the number of Likes. Why not press the Like Button, if you Download?