• Description: nice lens kinematic mount kit removed from High School laser lab. Measures: TOTAL height: 75,80mm. MAX width: 51mm. Base slot is 32mm long & 7mm wide. Lens mount is 2x2" (51x51mm). The lens holder is a bit smaller, around 51x49mm. It holds 31,7mm and smaller lenses (down to 28mm with actual "8-32" locking screw). If you want to hold lenses <28mm you need a larger "8-32" imperial type screw, (sold in or else here: https://www.newport.com/p/DE-8-0.63). The big hole is O 31,75mm (1,25"). It has 8-32 thread mount to mount in breadboard or other components (remember "8-32" is similar to M4 but with bigger thread pitch). Screws are metal 80 TPI. High quality. 
• Condition: normal usage marks. Nice working condition.
• Note: these items have been de-greased, cleaned, re-greased (with special oil, better than original grease) and checked for missing or damaged parts. Then tested and verified ok. Good functioning is garanteed.
• Issues: some marks of normal usage here and there.