TW898 is used in the MAX Rebar Tiers RB 398, 397, 518, 517, 217 & 218. It is 21 ga wire that is wound three times around the rebar. Also within that family of wire is the poly-coated wire (TW898-PC,) EG wire (TW898-EG,) USA made wire for federal jobs (TW898-US) and stainless steel wire (TW898-SS)