Newport MFM-B Mirror Flexure Mount Base,

The MFM-B Mounting Bracket provides variable optical axis height and solid attachment to surfaces. They allow angular adjustment to be made from either side, so you never obstruct the beam path during alignment. The MFM-B positions the optical axis height from 1 to 2 inch (25.4 to 50.8 mm). Compatible with MFM-075 and MFM-100
2 units available have a modified base as shown in the photo, 3 units available has a modified base and the upper most slot.
***MPN MFM-B
***OEM Newport Research Corp (NRC)
***SKU*** JB0103