·采用优质铬钒钢，经过硬化和回火处理·9件公制：1.5,2,2.5,3,4,5,6,8,10mm·9件英制：1/16", 5/64", 3/32", 1/8" ,5/32",3/16", 1/4", 5/16", 3/8"
