◇Round:012 .014 .016 .018 .020 U/L
◇Square::016X.016 .020X.020 U/L
◇Rectangular::016X022 017X022 017X025 018X022 018X025 019X025 021X025 U/L
◇Shape:NAT1(Asian shape) NAT2(American shape) NAT3(European shape)