| GENERAL CHARACTERISTICS ITEM DESCRIPTION | MATERIAL OPTICAL GLASS CLASS 1 GRADE B PER MIL-G-174A; FINISH SURFACES MARKED "P" POLISHED,ALL OTHERS GROUND; ANTI-REFLECTION COATING MULTI-LAYER TO MIL-C-675 PPE SPEC CS8; PAINT ALL GROUND SURFACES TO PPE SS2; O/A DIM. INSIDE DIA. 141.0 METRIC MINIMUM,141.5 METRIC MAXIMUM,OUTSIDE DIA. 144.5 METRIC MINIMUM,145.0 METRIC MAXIMUM |