  Due to a strong spin-orbit interaction and a large Land\'e g-factor, InSb
plays an important role in research on Majorana fermions. To further explore
novel properties of Majorana fermions, hybrid devices based on quantum wells
are conceived as an alternative approach to nanowires. In this work, we report
a pronounced conductance quantization of quantum point contact devices in
InSb/InAlSb quantum wells. Using a rotating magnetic field, we observe a large
in-plane (|g1|=26) and out-of-plane (|g1|=52) g-factor anisotropy.
Additionally, we investigate crossings of subbands with opposite spins and
extract the electron effective mass from magnetic depopulation of
one-dimensional subbands.
