Kodi pali kusiyana kotani pakati pa mtedza wawung'ono wa countersunk head rivet ndi mtedza waukulu wa countersunk head rivet?

Mutu wawung'ono wa countersunk ndi woyenera kuzinthu zolimba komanso zolimba.

Mutu waukulu wa countersunk ndi woyenera zipangizo zoonda komanso zofewa.