Models DFR550 and DFR750 have been developed as the advanced models of Model BFR440, featuring higher durability. These models feature a more reliable casing attachment.
- Lithium-ion batteries have greater life spans than their Ni-MH or Ni-Cad counterparts giving 430% greater run time.
- Lithium-ion's 40% weight saving means 18 volt power can be obtained by a battery that weighs the same as a 12 volt Ni-MH battery.
- Anti-tilt device to prevent screws from swaying.
- Dust proof construction.
- Foldable screw guide that keeps the screw strip tangle free.
- Silent clutch.