![](https://img.alicdn.com/imgextra/i2/228940135/TB206KxapXXXXX6XpXXXXXXXXXX_!!228940135.jpg)
There are many specifications, please contact customer service, specification 1: outer diameter 6mm* inner diameter 4 MM
& nbsp; Specification 2: outer diameter 5MM* inner diameter 3MM
& nbsp; Specification 3: outer diameter 4MM* inner diameter 2.5MM