The Takahashi 6X30 Finder Bracket is a heavy-duty finder scope bracket intended to mount onto the rear cell of Takahashi 78mm and larger refractor optical tubes only. The flat mounting baseplate comes pre-drilled with holes spaced to fit the Takahashi rear cells only and the mounting rings are designed only for a Takahashi 6 x 30mm finderscope. To center the finder, tighten three chromed ball-head bolts in the front of the mounting ring. At the rear, three non-marring nylon-tipped bolts allow you to collimate the finder with your Takahashi telescope's optics. Separate locking nuts on the collimating bolts hold the collimation firmly in place until you change it.