[21mm Green]
[17mm black]
[21mm purple]
[21mm blue]
[21mm gray]
[17mm yellow]
[17mm red]
Special features: protective caps
Material Type: ABS Plastic
External test certification: CCC
Model name: 17mm, 19mm, 21mm
Year: 2023n: Mainland China
Item Type:Nuts & Bolts
Feature: It prevents the s