GS gidaje ya wuce da ISO9001-2015 kasa da kasa ingancin management system takardar shaida, Class II cancantar ga sana'a kwangila na karfe tsarin injiniya, Class I cancantar ga yi karfe (bango) zane da kuma yi, Class II cancantar ga gine-gine masana'antu (ginin injiniya) zane, Matsayin Class II don ƙira na musamman na tsarin ƙarfe mai haske. Duk sassan gidajen da GS gidaje suka yi sun wuce gwajin ƙwararru, ana iya tabbatar da ingancin, maraba da ku ziyarci kamfaninmu.
