... 1.superior quality and the long-using life .2.available with cut-resistance .3.best competitive price4.OEM accept5.manufacture directly6 ... : 4.00-8,400-12-4/8, 400-14-4/8, 500-12-8/10, 500-14-4, 500-15-6, 500-16-8, 550-13-6, 550-16-8, 600-12-6 ... , 650-16-6 ...