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- 1/4" diameter
- 1/2" straight line centers
- 4 holes per sq. inch
- 20% open area
- 1/8" & 1/4" thick
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- 3/8" diameter
- 9/16" staggered centers
- 4 holes per sq. inch
- 40% open area
- 3/16" thick
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- 1/2" diameter
- 11/16" staggered centers
- 2.45 holes per sq. inch
- 48% open area
- 1/4" thick
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