Item: 3x4 D20L25 DR Series Aluminium Flexible Coupling Shaft Coupler Encoder CNC Stepper Motor d1xd2 : 3x4 mm Outer Diameter:20 mm Length:25 mm Body Material : Aluminum Alloy Pls kindly note: here is 5 pcs/lot. If you want to buy different length which the products isn't always in our store pls touch us; Special Bre Size And Slot Available On Request. Delivery: The goods might be sent for your address. Please make sure your address is correct. Feedback: We sincerely provide nice merchandise and superb service, so if you are satisfied with us, please go away your positive feedback, customers satisfaction and supportive is our best return If there is anything that you are not convinced with our item, please tell us so we are able to assist resolve the problems. Please don't go away a adverse feedback. Thank you so much.