Lub kaus taub hau rub stud hais nyob rau hauv qhov muag tsis pom rivet yog ib puag ncig lub taub hau rub stud los yog lub taub hau countersunk rub stud?

Umbrella taub hau rub studs tseem hu ua puag ncig lub taub hau rub studs thiab lauj kaub taub hau rub studs.Lub brim ntawm countersunk taub hau rub stud yog downward, thiab round taub hau rub stud yog upward.

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