Features Firm Connection for Stability: Connects two shafts with different diameters or a motor shaft, ensuring a reliable and stable joint coupling for optimal performance Efficient Alignment Support: Reduces stress on misaligned shafts by tightly fixing bearings and sprockets, promoting efficient operation for various applications Versatile Applications: Ideal for use in blowers, 3D printers, DIY robots, CNC machine tools, and stepping motors, providing extensive compatibility for your projects Precision Fit for NEMA 17: Designed specifically for NEMA 17 stepper motors, this motor shaft coupling features a 14mm diameter and 25mm length for a perfect fit Convenient 10-Piece Set: Made from premium aluminum alloy, this set includes 10 shaft couplings for easy replacement and installation, ensuring you always have a backup on hand Features: 1、Firm Connection: The coupling can connect two shafts with different diameters or one motor shaft for firm and stable connection. 2、Efficient Works: Fix the bearing and sprocket tightly on the shaft and reduce the stress when shafts are not in good alignment. 3、Extensive Using: Allows for wide application on blowers, 3D printers, DIY robots, CNC machine tools, stepping motors and more. 4、 Fitting: Suits ly for NEMA 17 step stepper motor, the coupler connector has 14mm diameter as well as 25mm length. 5、Including 10Pcs: Made from premium aluminium alloy material, all the 10pcs enable very convenient replacement and installation. Specification: Item Type: Shaft Coupling Product Size: Approx. 25 x 14mm / 0.98 x 0.55in (L x D) Application: Applicable to 3D printers, motor couplings, ship models, aircraft models, car models, engraving machines, etc. Product Adaptive Motor: 42 Stepper Motor Shaft Locking Mode: Screw fixed type. Package List: 10 x Shaft Coupling Note: betweendiv>1. The rigid design basically does not allow eccentricity, and must be fully adjusted during use. between/div>betweendiv>2. The design of single piece fixed screw clamp is convenient for setting items on the shaft and controlling the holding capacity of the coupling. between/div> Package List 10 x Shaft Coupling