Correct

扣环

/ kòu huán / 
Strokes

Definition

ring fastener/buckle/retainer strap

Example

As a Noun

snap/clip/retaining ring

1
Kòuhuán
扣环
mìfēng
密封

snap-ring seal

2
Kòu
扣
huán
环
diàn
垫
juàn
圈

retaining washer