3D Printer T8 400mm Stainless Steel Lead Screw Coupling Shaft Mounting BracketLead screw:Material: stainless steelDiameter: 8 mmThread Pitch: 2 mmLength: 400 mmNut:Material: brassDiameter: 8 mmThread Pitch: 2 mmMounted ball bearing:Material: zinc alloyBore diameter: 8 mmShaft coupling:Material: aluminiumShaft: 5 x 8 mmLength: 25 mmDiameter: 20 mmPackage included:1 x Screw1 x Nut2 x Ball supports1 x Shaft coupling