21 Miller Bone File 21 Miller Bone File BF21 The 21 Miller straight-cut bone file is used for final smoothing and shaping of bone with 8.1mm and 4.8mm working ends. Where to Buy x Category - Any - Dealer Partners Sales Representative Strategic Markets Schools Representative Accutronâ„¢ Equipment Sales Zip Code Find Representative Reset No results found. Please try a different search or explore: Sales Representatives | Dealer Partners | Strategic Markets | Schools | Accutron