HOLDER WITH 4 MIRROR-7575351;HOLDER 55.5 PERCENT BISMUTH/44.5 PERCENT LEAD;MIRROR PLATE GLASS TYPE I;EACH MIRROR 1.167 LG X 0.860 W X 0.125 THK;HOLDER PENTAGONAL 2.047 LG X 1.906 W X 0.97/0.98 WALL H;PENTAGON VEE 90 DEG ACROSS WIDTH;END OPPOSITE VEE BENT AT 45 DEG ANGLE;C/L OF EYEPIECE 0.872 FROM C/L OF OBJECTIVE;VEE WALLS 0.031 THK;2 DOWEL PIN HOLES 0.1255 DIA 0.749/0.751C-TO-C IN RIGHT ANGLE OF VEE 1.344 FROM PENTAGON BASE 0.750 FROM C/L OF EYE AND OBJECTIVE LENSES