Our Height Adjustment Platforms are ideal for adjusting the height of an optical system. A complete system requires the Plate Set (Stock #62-889) and one of the four available Post Sets. The Plate Set includes one top plate and one bottom plate. The top plate contains (35) M4 x 0.7mm tapped holes spaced 25mm apart. The Post Sets includes (4) 20mm Diameter Posts, (4) M6 S.H.C.S, and an Allen Wrench. Posts have Male and Female M6 Threads. Post Sets of 30mm, 80mm, 130mm, and 180mm Lengths are available to create a fixed height adjustment.