Comparison : Item # HPR531, Positive Hexagon, i.c. 0.639 / 0.645 in
Item # HPR631, Positive Hexagon, i.c. 0.764 / 0.770 in
Item # WHPR532, Positive Hexagon, i.c. 0.663 / 0.673 in
Item # WHPR633, Positive Hexagon, i.c. 0.788 / 0.798 in