This core holder is used in packing box of cling film, aluminum foil, etc. Roll film holder / Core ... / Paper core plugs are used in the packing box of cling film, aluminum foil, etc. It holds the rolled ... so that the roll doesn't touch the bottom of the box. It helps the roll to rotate more ... when the film/foil is pulled out for use.This light-weight, economical type of core holder is the best choise for ...