Qeybta 90-darajo ee isugeynta ah ee isugeynta ah ayaa inta badan ka kooban rollers, xirmooyin, bir-qabad, iyo qaybo kaxayn. 90-darajo isu rog rogrer compolor waxay ku tiirsan tahay kala-baxa inta u dhaxaysa rotter router iyo shayga si ay ugu dhaqaaqaan sheyga hore. Sida laga soo xigtay qaabkeeda wadista, waxaa loo qaybin karaa isku-darka roller aan awood lahayn, isku-darka roller ee korantada iyo isku-darka korantada. Foomamka khadka waa: toosan, qaloocsan, jaranjarooyin, saddex-cabbir, telescopic iyo fargeeto badan. In korantada roller gude, habka wadista baabuurta guud ahaan ma isticmaasho hal hab oo waditaan ah, laakiin badiyaa waxay qaadataa wado wadis, badiyaa isku darka gawaarida iyo sicirka, ka dibna waxay ku kaxeeyaan duurka si ay u wareegaan silsiladaha wadooyinka iyo wadooyinka wadista.

1. Tilmaamaha 90-darajo oo isugeyn ah oo isugeyn ah:
1.90-darajada shahaadada wareejinta ee isugeynta ah ayaa is haysta qaab dhismeedka, fududahay in la shaqeeyo oo la fududeeyo.
2. Way fududahay in la isku xidho iyo ka-hadalka inta u dhexeysa 90-darajo isku-darka isugeynta isugeynta. Khadad fara badan oo roller ah iyo qalab kale oo gudbinta ah ama diyaarado gaar ah ayaa loo isticmaali karaa in lagu sameeyo nidaamka isku-darka saadka ee isku dhafka ah.
3.90-darajad-isugeyn ah oo isku xirta wareejinta ayaa leh awood gaar weyn.
2. Baaxadda codsi ee 90 darajo shahaadada u rogaya isku xidhka:
90-darajo u beddelashada isugeynta roller-ka si ballaaran ayaa loo adeegsadaa warshadaha sida ogaanshaha shayga, weecinta, baakadaha, baakadaha iyo nidaamyada kale. Waxay ku habboon tahay in la gudbiyo dhammaan noocyada sanaadiiqda, bacaha, gogosha, iwm. Qalabka yar yar ama waxyaabaha aan caadiga ahayn ama alaabada aan caadiga ahayn ayaa loo baahan yahay in lagu qaado baloogyada ama sanaadiiqda.