The letter corresponds to the thickness or height of the lift and the number corresponds to the width.
HEIGHT A – 1/8″ or 3mm
B – 3/16″ or 5mm
C – 1/4″ or 7mm
D – 3/8″ or 9mm
WIDTH
0 – children’s or ladies’ size small
1 – ladies’ size 8-9
2 – boys’ & athletic shoes
3 – men’s size 8-9
4 – men’s size 10-12
5 – men’s size 13 +
Brand: G & W HEEL LIFT, INC.