Gilashin spline sune abubuwa masu mahimmanci a cikin injin da aka yi amfani da su don watsa wutar lantarki, suna ba da ingantacciyar hanyar canja wurin juzu'i.Wadannan ramukan suna nuna jerin raƙuman ruwa ko hakora, waɗanda aka sani da splines, waɗanda ke haɗawa tare da ramukan da suka dace a cikin ɓangaren mating, kamar kayan aiki ko haɗawa.Wannan ƙirar haɗin gwiwa yana ba da izinin watsawa mai sauƙi na motsi na juyawa da juyi, samar da kwanciyar hankali da daidaito a cikin aikace-aikacen masana'antu daban-daban.