Lead wires & cables: Special lengths, Protective hose
Shaft: Round, D-Cut, Cross drilled, Key-Way, Thread or Hollow
Winding: Resistance, Inductance, Rated Current, etc.
This bipolar Nema 17 stepper motor with step angle 1.8deg and size 42x42x48mm. It has 4 wires, each phase draws 1.68A, with holding torque 44Ncm (62.3oz.in). It's very good choice for 3D printer, a rear shaft is available.