打包扣
     尺寸：    1/2"          5/8"         3/4"        1"        1-1/4"
 
                     12.7mm      16mm     19mm      25mm        32mm
 
     厚度; 
 
                     0.36mm  0.4mm 0.5mm 0.55mm 0.6mm 0.7mm
  
                     0.75mm 0.8mm 0.9mm  1.0mm