Welcome to our store！</br> 1、Fitment: This conversion seat supports 20 inches frames from 451 To 406 wheel sets, P8 changed to 451 wheel sets, P18 changed to 451 wheel sets, etc. 2、Function: This extender can change the original V brake column position to the middle support position of the frame, making the overall appearance of the bike better. 3、Strong Structure: Made of aluminum alloy, brake caliper extender has a good luster bright color, not easy to fade rust, strong and high strength. 4、Excellent Workmanship: The extension seat is professionally manufactured and has excellent conversion performance, which is very suitable for those who like DIY bicycle transformation. 5、Installation Tip: Before installation, please make sure your bike has a middle support mounting hole. Easy to install, it comes with screws and nuts. <p class="wang-edit-text"><p class="wang-edit-text"> <p class="wang-edit-text"> Item Type: Conversion&nbsp;Seat Material: Aluminum alloy<style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Conversion&nbsp;Seat1 x Screw&nbsp; 1 x Nut&nbsp; Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>