JIAOZHOU SLOTTED HEAD COUNTERSUNK SCREW M4X0.7 X 12 MM. GB/T68-2000 4.8JIAOZHOU SLOTTED HEAD COUNTERSUNK SCREW M4X0.7 X 12 MM. GB/T68-2000 4.8JIAOZHOU SLOTTED CHEESE HEAD SCREW M6X1.0 X 12 MM. GB/T65-2000 35CrMoAJIAOZHOU SLOTTED CHEESE HEAD SCREW M8X1.25 X 20 MM. GB/T65-2000