A1 – Width of lens board
A2 – Height of lens board
B – Lip thickness
C – Overall thickness
P1 > P4 – Rabbet offsets on each side
D – Edge bevel. Most boards feature a bevel on the lower edge.
E – Corner radius
Boring – The lens board can be bored to the the desired diameter and profile, or left blank ( 0 – 1/2″ hole).