| MATERIAL | QUARTZ |
| REFLECTIVE BACKING MATERIAL | GLASS, MIL-O-13830, TYPE 620-603 |
| REFLECTION REDUCING SURFACE | BOTH |
| DIAMETER | 2.000 INCHES NOMINAL |
| WIDTH | 3.120 INCHES NOMINAL |
| LENGTH | 4.500 INCHES NOMINAL |
| THICKNESS | 3.380 INCHES NOMINAL |
| FEATURES PROVIDED | MOUNTING ATTACHMENT |
| SPECIAL FEATURES | FLATNESS 1/5 FRINGE;PARALLELISM 1 ARC SECOND;MOUNT STAINLESS STEEL BASE WITH ALUMINUM COATING AND PROTECTIVE OVERCOAT PER MIL-M-13508-FINISH IVORY ENAMEL;HEIGHT TO MIRROR CENTER 3INCHES;DIMENSIONS INCLUDE MOUNT EXCEPT FOR DIAMETER OF MIRROR |
| USAGE DESIGN | HIGHLY REFLECTIVE MIRROR POSITIONED AT 90DEGREES TO THE SURFACE ONWHICH IT RESTS;SUITABLE FOR USE WITH MOST HIGHLY SENSITIVE AUTOCOLLIMATORS |
| SUPPLEMENTARY FEATURES | MIRROR SURFACES ARE PERPENDICULAR TO BOTTOMN PADS WITHIN 2 ARC SECONDS;AUTO INDICATION OF AUTOCOLLIMATOR PARRALLELISM WITH WORK SURFACE;CONTACT PADS ON FRONT AND SIDES OF BASE |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | PRECISION CARRIAGE MIRROR |