... compitition in this field.Product intruduction1) Size: 1/2"*10,15,20,25,30,35,40,45,50,55,60,70,80 3 ... /4"*20,25,30,35,40,45,50,55,60,70,80 1 ... compitition in this field.Product intruduction1) Size: 1/2"*10,15,20,25,30,35,40,45,50,55,60,70,80 3 ... /4"*20,25,30,35,40,45,50,55,60,70,80 1 ...