Dura-Gold 14" Flexible Flat Bastard File Blade, Double-Sided with 9 Teeth Per Inch, Pack of 2 - Mounting Holes for Adjustable Body File HolderPack of 2 Dura Gold 14" Double Sided Flexible Flat Bastard File Blades with 9 Teeth Per Inch. Use blades with file holder for quick cutting and removal and to smooth cast iron, bronze lead, fiberglass and aluminum, metal, and plastic auto body fillers on flat and contoured surfaces. Blades have two mounting holes for use, attached to a file holder. Flat but flexible file blades with nine sharp precision milled curved teeth. Blades are made using high