BONOSS-wheelspacer-olina

Do you know what's the use of installing this wheel spacer?

[BONOSS OEM ODM] BONOSS forged active cooling wheel spacer for skyworth EV6

[BONOSS OEM ODM] BONOSS forged active cooling wheel spacer for Tesla modelY

[BONOSS OEM ODM] BONOSS forged active cooling wheel spacer for tesla model S

[BONOSS OEM ODM] BONOSS forged active cooling wheel spacer for model3

[BONOSS OEM ODM] BONOSS forged active cooling wheel spacer 15mm for Cadillac ct5

[BONOSS OEM ODM] BONOSS forged active cooling wheel spacer 25mm 30mm for BJ90