  We prove non-perturbative Anderson localization for quasi-periodic Jacobi
block matrix operators assuming non-vanishing of all Lyapunov exponents. The
base dynamics on tori $\mathbb{T}^b$ is assumed to be a Diophantine rotation.
Results on arithmetic localization are obtained for $b=1$, and applications to
the skew shift, stacked graphene, XY spin chains, and coupled Harper models are
discussed.
