These collets wouldn't be complete without the nut to fasten it on to the router. This nut must be used with these collets. NOTE: We no longer carry collets and nuts for Porter Cable 890 Series or Bosch Colt (PR20EVSK) series
For Bosch Colt - These collets MUST be used with BOPG-COLT-NUTs and Spanners. They will not work with the nuts and spanners that are supplied with your router.