square head set screw: 1Standard:DIN,GB,ASTM,BS,or by ... ,8.8,10.9,12.9 ( General and High strength) >> Surface treatment: plain, black, zinc, electro galvanize, hot dipgalvanization, Dacrotized and ... honorary certificates: 3. Product: Black( M20*140 ) & HDG( M22*130 ) square head screws 4. Factory view figures: PackagingFactory viewTesting equipmentsWorkshop Welcome ...