Shure Microflex MX391 Series Specifications page 14

1.905 cm (.750 in.)
14
C10
5.304 cm
(2.088 in.)
7.940 cm
(3.126 in.)
R6 and R4
Q2
Q8
Q3
Q9
Q7 Q6
C11 C11
R13 and R16
4.158 cm
(1.637 in.)
Q1
Q5
2.921 cm
(1.150 in.)
.5 in. Hole
3.175 cm
(1.250 in.)