3D Printer T8 300mm Stainless Steel Lead Screw Coupling Shaft Mounting BracketLead screw:Material: stainless steelDiameter: 8 mmPitch: 2 mmLead: 4Length: 300 mmNut:Material: brassDiameter: 8 mmPitch: 2 mmLead: 4Mounted ball bearing:Material: zinc alloyBore diameter: 8 mmShaft coupling:Material: aluminiumShaft: 6.35 x 8 mmLength: 25 mmDiameter: 20 mmPackage includes:1 x Screw1 x Nut2 x Ball bracket1 x Shaft coupling