Size ? Model<br>  M: retainer plunger <br>  L:threaded plunger <br><br>Material: engineering ABS, steel axis<br><br>Jack type: retainer plunger (flat), threaded<br><br>Usage:miltiple use for computer chairs, office chairs, size is common in general.<br><br>Features: high quality PU, smooth and mellow, durable, ultra-quiet, there is no scratches to floors when rolling, have a good protective effect.<br /></p> <br /></p><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-1-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-2-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-3-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-4-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-5-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-6-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-7-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-8-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-9-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-10-original.jpg" alt=""width="800" noproxy><p style="text-align: center;"><img src="https://contestimg.wish.com/api/webimage/5595083b45e90e405b550473-11-original.jp" alt=""width="800" noproxy>