Injin masana'antu, dumama da tsarin kwandishan, kayan aikin injin.
Ana amfani dashi a bushe, damshi da rigar ciki (ciki har da gaurayawan ruwa-mai), amma ba don amfanin waje ba.
Don ƙayyadaddun shigarwa a ƙarƙashin matsakaicin nauyin nauyin inji, da aikace-aikace tare da jujjuyawar lokaci-lokaci a kyauta, motsi mara ci gaba ba tare da ɗaukar nauyi ko jagorar dole ba.