Kiyi ya hex, yomwe imadziwikanso kuti Allen wrench kapena Allen key, ndi chida chamanja chomwe chimagwiritsidwa ntchito kulimbitsa kapena kumasula zomangira ndi mabawuti okhala ndi sockets hexagonal.Monga opanga ma hardware odziwika omwe ali ndi zaka 30, timanyadira popereka makiyi apamwamba kwambiri a hex omwe amakwaniritsa zosowa zosiyanasiyana za makasitomala athu.