LBTEK 45° Stainless Steel Mounting Adapter is used to securely mount MT series optic mounts compatible with Ø25.4 mm or Ø50.8 mm optics, or optic mounts with a rear plate thickness of 15 mm, at a 45° angle relative to work surfaces such as optical tables or breadboards. The mount is installed via the M4 threaded hole on the top. There is an M6 threaded hole at the bottom, which can be used to install a Ø25.0 mm post or a post holder base to meet common mounting requirements. Each threaded hole is surrounded by two Ø2 mm alignment pin holes for direct/precise mounting in custom or OEM systems.