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Notice: the Specification "5mm-8mm" skill "one bore diameter of the coupler is 5mm ,the different is 8mm"Type: D20L34Material: AluminumOuter Diameter(D): 20mmLength(L): 34mmBore Diameter: 5mm-5mm, 5mm-6mm, 5mm-6.35mm, 5mm-7mm, 5mm-8mm, 5mm-10mm, 6mm-6mm, 6mm-6.35mm, 6mm-7mm, 6mm-8mm, 6mm-10mm, 6.35mm-6.35mm, 6.35mm-7mm, 6.35mm-8mm, 6.35mm-10mm, 7mm-7mm, 7mm-8mm, 7mm-10mm, 8mm-8mm, 8mm-10mm, 10mm-10mmPackage Included:Coupler x 1