Material: 45# carbon steel↔? quenching process↔? the hardness is stronger<br />Function: Bicycle tooth disc is removed↔? the top rod is longer↔? can remove the square mouth and spline teeth and crank↔? with a wrench↔? practical more convenient<br /><img src="http://img6.eachbuyer.com/x9/p100/eb01072_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb01072_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb01072_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb01072_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb01072_5.jpg" />