E rua paraharaha runga noa, te Rau piauau Plate Top me te Sheet Plate Top Kirihou.
Ko te whārangi piauau paraharaha Top he werohia whakarewa ki te whārangi piauau, e hā nei, maramarama, wera-faaore, pepa-kore, anti-ha'iriiri e, me te roa.
Ko te pereti nui-tere kirihou he werohia-whakarewa ki kirihou engineering kawemai. thickened te taiepa paepae e ka whakaarahia ki te ārai i te paepae i te tilting me tilting i roto i te puoto. he ātete ki te pānga, hoholo me te deformation te paraharaha whānui, a taea tōtika te tu i te taimaha o te sliver.