Flexible auto body surface file blades, 14" O.A.L, 1 1/4" wide X 5/32" thick. Fully heat treated. Offered in 4 styles: (2) flat types: BFB47-8 T.P.I, BFB58-15 T.P.I (2) 1/2 round styles: BFB22-8 T.P.I Choose the 8 tooth per inch for weld and aggressive material removal and the 15 tooth per inch for fine surface smoothing & blending. These files will work on all brands of file handles not just our BF53 series. auto body repair and restoration, metal shaping, and metalworking. The flat files are reversible for additional life (BFB22 half round one sided)and all styles are fully flexible to work flat, concave or convex surfaces. Made in USA/England