ITEM NAME:8-10mm Aluminum Flexible Shaft Coupling Rigid Coupler Motor Connector J2B6 8-10mm Aluminum Flexible Shaft Coupling Rigid Coupler Motor Connector J2B6 Material: Aluminum Alloy Diameter*Length: 16*25mm color is Water Blue Screw Hole diameter: 4mm Up and down Hole diameter: 8-10mm Package included: 1x Coupler 1x spanner 4x Screw Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.