This is for Obsessions made before Kriege starting installing these as standard. Per Obsessions site..
NEW SECONDARY MIRROR HOLDER
Spring action push-pull adjusting secondary mirror holder. Our new design makes collimating the secondary mirror easier than anything on the market. No screwdriver needed. No need to loosen an opposing screw to tighten another like on 4 screw designs. No fumbling around in the dark. Three brass knurled knobs with compression springs allow you to collimate the tilt of the mirror without even looking at it. Takes only seconds to do. Now the best is even better.
Included free is a nylon strap for your scope cover.