Specifications: Led screw diameter: 8mm Leas screw length: 300mm Step angle :1.8 degree Nut material: Brass Holding Torque: 400mNm Thrust(full step): 480g Rated Current/Phase:1.2A Rate Voltage: 3.3v Rated Resistance/Phase:2.2±10%ohm Package List: 1 x NEMA 17 Lead Screw Motor with cable. 1 x T8 L300mm 8mm Lead Screw Brass Leads Screw and Nut.