square head set screw: 1Standard:DIN,GB,ASTM,BS,or by ... 6,8.8,10.9 4Certificate:SGS Rail Timber Drive Screw Spike/ Twist Timber Spike >> Specification : DIN,GB ... 140,M22*130 >> Material : Carbon steel >> Shape of head: Hexagon head >> Grade: 4.6,4.8,5.6,5.8 ... Product: Black( M20*140 ) & HDG( M22*130 ) square head screws 4. Factory view figures: PackagingFactory viewTesting equipmentsWorkshop Welcome your ...