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Suitable for 3D printer and other machine which uses shaft 5mm to 8mm / 0.19 to 0.31 inch it also can be used with other 3D printers and CNC machines which are using 5mm shaft motor to 8mm lead screw. Size: 25x20mm/ 0.98x0.79inch( L*OD) ; Material: aluminum alloy These coupler is using 2 screws and 2pcs set screw to fix, more stable and durable Package: 2pieces lead screw couplers