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Product Name: RC Boat Car Metal Cardan Joint Gimbal Couplings Shaft Motor ConnectorMaterial: Iron plating (45 steel)Product Description: For example, 4x5mm: 4mm and 5mm holes on every single side, could be inserted and fixed The corresponding length diameter of the shaft or motor.Size:2.3x2.3mm, 2x2.3mm, 2x2mm: OD 8mm, size 18mm, weight approx. 8g, facet M3 fixing.2.3x3mm, 3x3mm, 3x3.17mm, 3.17x3.17mm: OD 9mm, length 23mm, weight about 8g, side M3 fixing.3.17x4mm, 3x4mm, 4x4mm , 2.3x4mm: OD 9mm, length 23mm, weight about 7.5g, side M3 fixing.3x5mm, 3.17x5mm, 4x5mm, 5x5mm, 4x6mm, 5x6mm, 6x6mm: OD 11mm, size 23mm, weight about 10g, side M4 fixing.5x8mm, 6x8mm, 6.35x8mm, 8x8mm: OD 14mm, size 35mm, weight about 20g, side M4 fixing. (This model has a card spring design fixed, so there's a little tight, is normal)8x10mm, 10x10mm: OD 16mm, size 35mm, weight about 28g, facet M4 fixing.Scope of use: motor, straight shaft use, suitable for mannequin cars, mannequin ships, robots and other The use of metal adapter.Iron plating common joint, you might flip and alter the direction of transmission. Suitable to be used on vehicle models, boat models, small and delicate, durable.Send screws with every single coupling. Send 1pcs wrench consistent with order.Pack Quantity: 1Pcs