Feature:- Easy to install.- Durable with high precision.- Can withstand great weight.- Suitable for 3D printer Z Axis and stepper motor.Lead Screw:- Material: Stainless Steel- Diameter: 8mm- Length: 300mmNut:- Material: Brass- Diameter: 10mm- Pitch: 22mmMounted Ball Bearing:- Material: Zinc Alloy- Model: 608RS- Bore Diameter: 8mm- Total Size: Approx. 47x8x26mmShaft Coupling:- Material: Aluminium- Diameter: 20mmPackage Weight: 180 G / 6.35 OuncesPackage Dimensions (L*W*H): 300*60*40 MM / 11.81*2.36*1.57 InchesPackage Include:1 x Lead Screw1 x Nut2 x Mounted Ball Bearing 1 x Shaft Coupling