RG = Round holes in straight rows

QG = Square Holes in Straight rows

RV = Round holes in staggered rows

QV = Square holes in staggered rows

RD = Round holes diagonlly staggered

QD = Quare holes diagonally staggered

LG = Slotted round holes in straight rows

LGE = Slotted square holes in straight rows

LV = Slotted round holes in staggered rows

LVE = Slotted square holes in staggered rows