o-ring/c-clip是同样东西，各地叫法不同。homedepot/amazon有

上面有个小键卡，设定里外用途。

https://www.homedepot.com/p/Channellock-8-in-Retaining-Ring-Pliers-927/100348008

https://www.amazon.com/ABN-Snap-Ring-Pliers-Interchangeable/dp/B00YHFKHPC/ref=sr_1_9?keywords=c-clip+pliers&qid=1557507824&s=gateway&sr=8-9

所有跟帖： 

• 同样的Channellock Amazon便宜10刀 -2ndGear- ♂ (750 bytes) () 05/10/2019 postreply 10:30:05

• 这个好，可以换开合方向，刚刚去加拿大轮胎看了，39+13%TAX -bushihandyman- ♂ (0 bytes) () 05/10/2019 postreply 12:13:51