NEMA 17 Hollow Shaft Stepper Motor, 1.8°, 42*42mm, 4 Wires
Nema 14 Hollow Shaft Stepper Motor Bipolar 18Ncm (25.5oz.in) 0.8A 35x35x34mm - 14HS13-0804SH|STEPPERONLINE
DINGS - Precision Motion Specialist
Hollow-Shaft Motors – NEMA 17 – Stepper Motors | NANOTEC
Amazon.com: WANGYOUCAO Nema 14 Hollow Shaft Stepper Motor 34mm 1.8deg 18Ncm(25.5oz.in) 0.8A 4-Lead Step Motor for CNC 3D Printer 3D Printing Accessories : Industrial & Scientific
Nema 17 Hollow Shaft Stepper Motors — DINGS' Motion USA