3D Printer T8 300mm Stainless Steel Lead Screw Coupling Shaft Mounting BracketLead screw:Material: Stainless stellDiameter: 8 mmPitch: 2 mmLength: 300 mmNut:Material: BrassDiameter: 8 mmPitch: 2 mmMounted 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