New Precision Aluminum Rigid Shaft Coupler 8mm x 8mm 
4 Set Screws, 2 on each side
Outside Dimensions: Diameter 14mm, Length 25mm

Package contents: 1 Coupler, 4 Grub Screws, 1 Allen Wrench*. No other items or accessories such as shaft, motor or leadscrew included

1 ALLEN WRENCH PER ORDER NOT PER COUPLER