Na'ura mai yin yashi na'ura ce ta gama gari, wacce aka fi amfani da ita don murkushe ma'adanai da duwatsu daban-daban, gami da granite.Granite dutse ne mai wuya wanda yawanci yana buƙatar ƙarfin murkushe shi don karya shi cikin girman da ake so.
Injin yin yashi counterroll yana murkushe kayan ta hanyar rollers guda biyu masu jujjuyawa kuma suna samar da takamaiman kayan da aka gama.Saboda tsarinsa mai sauƙi da aiki mai dacewa, zai iya inganta ingantaccen samarwa zuwa wani matsayi.Koyaya, fitowar na'urar yin yashi yana shafar abubuwa da yawa, kamar nau'in abu, taurin, zafi da sauransu.Ga wasu kayan da ke da ƙananan tauri da ƙarancin zafi, yashin yin ingantacciyar ingin yashi na nadi ya fi girma.
Alal misali, a cikin masana'antar gine-gine, abubuwan da ake buƙata don na'urori masu yin yashi suna da ƙananan ƙananan, yawanci a kusa da 10-400 a kowace awa;A cikin masana'antar hakar ma'adinai, abubuwan da ake buƙata don samar da yashi na na'ura suna da girma, wanda zai iya kaiwa ɗaruruwa ko ma dubban ton a cikin awa ɗaya.
A takaice dai, injin yin yashi na nadi shine kayan aikin murkushewa na yau da kullun, don murƙushe dutse mai ƙarfi kamar granite, kuna buƙatar zaɓar samfurin da ya dace da ƙayyadaddun ƙayyadaddun abubuwa, da daidaitawa da kulawa da dacewa, don cimma sakamako mai ma'ana.
