THORLABS Ø12.7 mm Precision Kinematic Mirror Mount, 3 Adjusters, M4 Taps + 1/2" mirror Description: a mini precision kinematic mirror mount with a laser filter mounted from a R D lab. closed down. You would need a typical 2mm allen tool (2.0 hexagonal) to move the kinematic screws. It has a Ø 1/2" dieletric mirror, but I don't know which special coating it might have, probably some IR coating since it was operated in IR laser enviroment. Measures: https://www.thorlabs.com/drawings/f57cd140fe311b1f-084FA729-9627-553B-DD6EA3EB8E794D85/KS05_M-AutoCADPDF.pdf Other measures: Base dimensions: 20x33mm. Total height: 46mm. Condition: used but in perfect smooth working order. Like new condition. Mirror is glued (seems heat-melting glue) to the mount. Mirror conditions is good but with LIGHT SCRATCHES (see pics). There is missing the normal locking screw ("NYLON-TIPPED LOCKING SCREW 2.0mm [5/64in] HEX FOR SECURING OF OPTICS"), which is a normal M4 (metric) allen head grub. I send a metal M4x3 replacement, but it would be a great idea to get some plastic M4x3 grubs (very cheap BTW) to protect pricey optics.