Universal milling da hakowa inji wani nau'i ne na gama-gari kayan aikin yankan ƙarfe.
Spindle taper rami na inji na iya zama kai tsaye ko ta hanyar abin da aka makala shigar da duk abin yankan niƙa na silinda, mai yanka diski,
gyare-gyaren abun yanka, ƙarshen milling abun yanka kayan aiki, dace da sarrafa iri-iri na kananan sassa na jirgin sama, karkata jirgin sama, tsagi,
ramuka, da sauran kayan aiki.Masana'antu ne na inji, mold, kayan aiki, kayan aiki, motoci, babura da sauran masana'antu
na manufa sarrafa kayan aiki.