Stainless steel 1.4301. With screwthread shaft connection as outlined below.

Propeller stirrers 4-blade
Stirring rotors 4-blade
Impellers 4-blade
Stirring shafts 4-blade
Paddles 4-blade
Propeller stirrers 4-blade
Stirring rotors 4-blade
Impellers 4-blade
Stirring shafts 4-blade
Paddles 4-blade