Package: 1 x Flange Shaft Coupler (with fixing screw) The outer diameter of the cylinder is 15 mm, the height of the cylinder 12 mm and the total height 15 mm. Aluminum Motor Coupler AURARMLET 10Pcs Steel Flange Coupling Motor Guide Shaft Connector For Model Accessories 5Mm Round Silver Motor Shaft Coupling Durable and insulating, it makes its shaft more stable, easy to install and replace. Sturdy and]: Made of 45 steel, the 2mm flange coupling connector is strong, wear-resistant and provides longevity, perfect for RC models Type: flange shaft coupling, suitable for model shaft connection, perfect accessories for RC model motor etc. The fixing screw is M3., The inner diameter is 5mm and 6mm. Durable and insulating, make your shaft more stable, easy to install and replace. Inner diameter: 3mm gold, 4mm black, 5mm red, 6mm blue, 8mm purple (optional) Specifications: The inner diameter is 3mm and 4mm. 8MM Inner Dia H13*D16 Rigid Flange Coupling Motor Guide Shaft Coupler Motor Connector Silver Tone For Diy Part Type: flange shaft coupling, suitable for model shaft connection, perfect accessories for RC model engines etc. Function]flange coupler is produced based on International Flange Standard, which can fix one shaft to a plane and install other parts on the shaft easily. Double connection points fasten the coupler tightly. [Wide Applications]Widely used in model shaft connection, perfect accessories for RC Model motor. Brand: TA-VIGOR Size... Material: aluminum alloy, heat treatment hardened, then electroplated.