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Lead Screw: Material:Stainless steel lead screw, brass nutScrew diameter:8mmScrew spacing:2mmLead of thread:8mm Package list:2×OD 8MM Axis length 300mm4×SK8 Linear Axis bracket1×THSL-300-8D T-type T8 Lead Screw1× T8 Lead Screw Copper Nut2× KP08 T8 Lead Screw bracket2× SC8UU1× Screw Nut housing bracket1× Flexible Coupling 5*8