The shelf provides level support for laser interferometer measurement of prisms, cubes, etc. Locking slides allow vertical travel (the 4-inch version provides 2.75 inches travel; the 6-inch version provides 3.25 inches travel).
The shelf itself includes a mounting hole array in either English (1/4-20 threaded holes on 1 inch centers) or Metric (M6 threaded holes on 25 mm centers) configurations.
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