Neefka madaxa ee Countersunk (sidoo kale loo yaqaan flat head rivet nuts) ayaa ah xirmooyin gudaha ah oo dunsan oo si gaar ah loogu talagalay biraha xaashida ah. Rakibadu waa degdeg waana sahlan tahay, waxayna u baahan tahay kaliya qoriga rivet. Hawlgalku waa aamusnaan aadna u hufan. Kaliya dhig lawska rivet ee xabka qoriga, geli dhamaadka lawska godka birta ah, oo adkee qoriga si aad u dhamaystirto riveting.
Waxaa jira noocyo badan oo looska rivet madaxa fidsan, oo ay ku jiraan looska rivet madax siman oo caadi ahaan loo isticmaalo, looska rivet madax fidsan laba geesood, iyo madaxa fidsan lowska rivet rivet. Ikhtiyaarada kale waxaa ka mid ah lowska rivet-ga leh ee madaxa ka soo horjeeda, looska laba geesoodka ah, lowska yar ee madaxa countersunk, iyo lowska rivet ee imperial.
Looska rivet waxaa loo kala saaraa gudaha iyo dibadda laba geesoodka lawska, nus - laba geesood ah, lowska madaxa countersunk, lowska madaxa countersunk yar, looska rivet madaxa fidsan, dalool indha la'aan nuts, iyo wiishka{1}} nuts rivet gaar ah. Waxay ka samaysan yihiin birta kaarboonka iyo birta aan lahayn.
Nooc ka mid ah lowska rivet wuxuu ku habboon yahay aluminiumka aluminiumka ah ee dhumucdiisuna kala duwan tahay iyo taargooyinka birta ah ee dhumucdoodu u dhaxayso 1 ilaa 2.5 mm. Isticmaalka looska birta ah ee ka kooban aluminiumka aluminiumka ah ayaa si gaar ah xusid mudan, fududaynta habka caajiska ah ee taarikada birta ee hore - iyo si weyn u wanaajinaya habsocodka.