The 9854 Tilting Opti-Claw™ Mount allows you to not have to adjust the height of the mount every time you want to use a different-diameter optic. This clever mount automatically centers any optic with a diameter from 0.10 in. (2.5 mm) to 2.0 in. (51 mm) to within 0.005 in. When used together, two Opti-Claw mounts are ideal for mounting HeNe lasers or other cylindrical objects. For mounting thin optics, the jaws have V-grooves.