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By certification 
Item B sizes：10mm, 12mm, 14mm, 15mm, 17mm, 19mm, 21mm, 23mm, 25mm, 28mm, 30mm, 35mm, 42mm
item A sizes：6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 17mm, 19mm, 21mm, 23mm,25mm
Square sew on snap button sizes：11mm, 13mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm
item A sizes：6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 14mm, 15mm, 17mm, 19mm, 21mm, 23mm,25mm
Square sew on snap button sizes：11mm, 13mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm
