The 42mm bending and back former works with the REMS Curvo 50 benders on hard, half-hard, soft copper tubes (also thin-walled) and on copper pipes K65 for refrigeration and air conditioning technology in accordance with EN 12735-1, EN 12449. The REMS Adapter Support 35mm-50mm is needed for the Curvo 50.R mm: Bending radius mm at the neutral axis of the bend: 140