95WNIFE tungsten bucking bar price DWG.NO. 091658 which density is 18.0g/cm3 is 33.00 USD/PC on May 31, 2018. Bucking bars used to form bucktails on rivets and come in many different shapes and sizes. They are normally made from tungsten alloy material. The particular shape to be used depends upon the location and accessibility of the rivet to be driven.