Kalmar "fishtail bit" yawanci tana nufin nau'in rawar sojan da ake amfani da ita wajen aikin katako. Ana kiransa da bitar kifi, domin ƙarshensa yana kama da jelar kifi. itacen oak ko maple. Ƙarshen da aka nuna na bitar yana sauƙaƙa don fara rami, yayin da faɗin tushe yana taimakawa wajen hana ɗan yawo yayin da yake zurfafawa cikin itace. ana amfani da shi don hako ramuka a wasu kayan, kamar filastik ko karfe. Ana samun su a cikin nau'i-nau'i masu girma dabam kuma ana iya amfani da su a cikin aikin motsa jiki na hannu da na lantarki.