"The Mini E-Z fletch is designed to fletch any carbon or aluminum arrow from Ultra Micro diameter all the way up to 5/16"" standard diameter. This tool will fletch vanes or feathers up to 3"" long. This tool gives a strong left helical for maximum broadhead stabilization and accuracy. Accomodates arrows up 5/16"" in diameter Fletchs vanes or feathers up to 3"" long Left helical Accomodates Ultra Micro diameter arrows"