ED 17 . 47.6mm - 50.8mm

  Spring Collet for Pratt Burnerd Collet Chuck.
  
  Chucks KC - 20  (Key Collet)  &  PC - 20  (Lever Lock)
  ED Range of Collets.
  Used but all checked, clean, swarf free and fully working. 
  Original Burnerd Manufactured with Spring Loaded Blades (Not Reproduction collets with Rubber Mount)
  See picture #2 for collet dimension to confirm correct chuck.