... >> Shape of head: Hexagon head >> Grade: 4.6,4.8,5.6,5.8,6.8,8.8,10.9,12.9 ( General and High strength) >> Surface ... used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, Malaysia and Africa and so ... on. Pictures: 1. Certificate: 2. Various honorary certificates: 3. Product: Different ...