  We report single crystal growth of strongly-correlated compound
K$_2$Cr$_3$As$_3$ with superconducting temperature $T_{\textrm c}$=6.2 K, and
the measurements of magnetic susceptibility $\chi$ above $T_{\textrm c}$. We
determined the hyperfine coupling constants directly from the relation between
the Knight shift ($K$) and susceptibility ($K$-$\chi$ plot) and obtained the
orbital contribution $K_{\textrm{orb}}$. Our results of $K_{\textrm{orb}}$ is
in fairly good agreement with the previous estimate using a novel method, and
reinforce the conclusion that K$_2$Cr$_3$As$_3$ is a spin-triplet
superconductor.
