uxcell 8mm to 8mm Flexible Plum Coupling Shaft Coupler D25L34 for CNC Motor Product Name : Plum Coupling Coupler;Type : 8mm to 8mm(5/16" to 5/16") Side Thread Diameter : 2.5mm/ 0.1";Fixed Type : Clamp Length : 34mm/1.3";Diameter : 25mm/0.98" Material : Aluminum Alloy;Color : Silver Tone Net Weight : 36g;Package Content : 1 x Plum Coupling Coupler