HR-F Stapler A "hog ring" stapler is used in conjunction with a poly vinyl flax string or tape. This stapler binds together branches to wire for trellis, or vines to trellis when used with the special binding twine. The HR-F increases tying efficiency by 3 times. Simply wrap your tying material (AgriFlex, Jute, etc.) around what you want to tie and staple. A hog ring type staple binds the string together. Then slide the ends of your tying material through the cutter. Staples and blade required.