Sprite Science™ 3D Printer Stepper Motor NEMA17 Bipolar 40mm 64oz.in(45Ncm) 2A 4 Leads CNC Motors

Bought this to upgrade a weak motor on my prusa i3 3d printer. It has worked flawlessly so far and has much more torque than the one it replaced.

I'm not sure why these are sold without accompanying mounting screws. Other than that it's a good product