Puas yog countersunk taub hau rivets xav tau countersunk qhov?
Ua ntej siv lub taub hau qhib lub taub hau rub rivet, nws yog ib qho tsim nyog yuav tsum tau ua ib lub qhov countersunk ntawm lub phaj ua ntej, txwv tsis pub nws yuav yooj yim kom tsis sib xws tom qab riveting.