ITEM NAME:D19L25 Flexible Shaft Coupling CNC Stepper Motor Coupler Connector 19x25mm Alloy Product Description Description: D19L25 Stepping Motor Jaw Shaft Coupling 5mm To 8mm Aluminium Alloy Flexible Coupling OD 19x25mm Specification: Nominal torque: 0.4-3 N.m Shaft hole : 5*8mm Dimensions : 19 X 25mm/0.75 X 0.98" Allowable speed: 1100-2200r/m Nominal torque: 0.4-3N.m Aperture : 5mm Product size: 25 X 19 X 19mm/0.98 X 0.75 X 0.75" Packing size: 27 X 21 X 21mm/1.06 X 0.83 X 0.83" Net weight: 15g Gross weight: 18g Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3mm measuring deviation due to manual measurement. Included: 1 X Flexible Coupling.Included: 1 X Flexible Coupling. Shaft hole : 5 8mm. Allowable speed: 1100-2200r/m. Warranty Service. If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item.