... Bolts and Nuts1. Material: 35k,q235, c1010 2. Surface: Black, ZP, HDG 3. Grade:4.8,6.8,8.8 4 ... Hex Bolts and Nuts1. Material: 35k,q235, c10102. Surface: Black, ZP, HDG3. Grade: 4.8,6.8,8.84. Standards: DIN933 ... strict quality control to ensure good quality. DIN933 HEX BOLTS ZP BLACK