50 series staple is applicable to sofa, industry, and so on

Description 
50 series staple:

Gauge: 20 Ga 
Crown: < xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />12.50mm
Width: 1.20mm
Height: 0.60mm 

50 series staple is fine wire staple.

Finish: Galvanized, Copper