Burs / dental bur
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1. FG (shank standard, FG)   ISO No. 806 314 (313) â¦â¦â¦
  Shank (D) = 1.60mm
  Over length (L) FG (314) = 19mm  FGS (313) = 16mm
2. RA (Right angle, RA Latch, CA standard) ISO No. 806 204 â¦â¦â¦
   Shank (D) =  2.35mm
   Over length (L) RA(204)=22mm
3. HP (Handpiece)   ISO No. 806 104 â¦â¦â¦
   Shank (D) = 2.35mm
   Over length (L)  HP (104) = 44.5mm