square head set screw: 1Standard:DIN,GB,ASTM,BS,or by client 2Size:M20*140,M22*130 3Grade:4.6,5.6,8 ... >> Material : Carbon steel >> Shape of head: Hexagon head >> Grade: 4.6,4.8,5.6,5.8,6.8,8.8,10 ... certificates: 3. Product: Black( M20*140 ) & HDG( M22*130 ) square head screws 4. Factory view figures: PackagingFactory viewTesting equipmentsWorkshop Welcome your visit ...