Features:
Rigid shaft coupling, compatible with 3D printer, machine, stepper motor, etc.
5mm to 8mm bore, total length 25mm, outside diameter 14mm.
Made of alloy, and wear resistant.
High torque with rigidity, low intertia and sensitivity.
Compatible with NEMA 17 stepper motors(for 5mm shaft diameter).

Specifications:
Color:
Material: Alloy
Quantity: 1pc/ 2pcs/ 3pcs
Bore Diameter: 5mm to 8mm
Outside Diameter: 18mm
Length: 23mm
Item Weight(each): 18.5g/ 0.7oz

Packing List:
3 * Rigid Coupling