Main Features:<br />Brand new.<br />High quality aluminum material.<br />Motor axle hole diameter: 3.17mm.<br />Suitable for brushless motors and speed controllers.<br />Delicate workmanship.<br />Material: Aluminum.<br />Motor Axle hole diameter: 3.17mm.<br />Single item size: 2.4 x 1.2cm(L x D).<br />Single item weight: 4g.<br /><br />    Specifications<br />Dimension and Weight<br />  Package Weight: 0.077 kg                                                  <br />                        Package Size (L x W x H): 8 x 6.5 x 2.5 cm                                                 <br />Package Contents<br />  Package Contents: 5 x 3.17mm Propeller Adapter                                                 <br /><br /><br /><br />                                            <br /><br /><br /><br /><br /><br /><br /><br /><br /><br />                       Product Safety Disclaimer: <br />We do not accept any responsibility or liability for misuse of this or any other product.  All our products are extensively tested to comply with rigorous and strict QC standards.  For certain products (e.g. toys? knives? etc.)? we recommend proper supervision as we cannot be held liable for misuse or accidents.<br /><br />                                                <br />