Similar to rigid clamp couplings, shaft couplers are used to hold bearings and sprockets tightly on the shaft, and are used in motor and gearbox assemblies. Single piece set screw clamp design makes it easy to set up the items on the shaft and control the holding capacity of the coupling. Uxcell Coupler Uxcell 5mm To 1/4 Inch Bore Rigid Coupling Set Screw Sierra Motor Shaft Connector About this item Connection Bore Diameter: 5mm to 6mm; Total Length: 25mm /0.98 inch, Outside Diameter : 14mm/ 0.55 inch; with M4 Screws Widely used in blowers,3D printer,DIY robots,CNC machine,stepper motors,etc. Similar to rigid clamp couplings, shaft couplers are used to hold bearings and sprockets tightly on the shaft, and are used in motor... Widely used in blowers,3D printer,DIY robots,CNC machine,stepper motors,etc. uxcell 5mm to 1/4 Inch Bore Rigid Coupling Set Screw L25XD14 Aluminum Alloy,Shaft Coupler Connector for 3D Printers, Motor Accessories,Dark Blue International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.