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It indicates how many staples per strip. S.F. 1 and S.F. 4 are 210 staples/strip. S.F. 3 is 105 staples/strip, i.e. a half strip. Larger staplers take the full strip, smaller ones take the half. The S.F. actually stands for "Stapler Food" which personally I find a little stupid, but that's what it stands for...
Also, S.F. 1 are standard-quality staples while S.F. 3 and S.F. 4 staples are premium-quality staples.
What else can I help you with?
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