  This talk presents results of weak matrix elements calculated from
simulations done on 170 $32^3 \times 64$ lattices at $\beta = 6.0$ using
quenched Wilson fermions. We discuss the extraction of pseudoscalar decay
constants $f_\pi$, $f_K$, $f_D$, and $f_{D_s}$, the form-factors for the rare
decay $B \to K^* \gamma$, and the matrix elements of the 4-fermion operators
relevant to $B_K$, $B_7$, $B_8$. We present an analysis of the various sources
of systematic errors, and show that these are now much larger than the
statistical errors for each of these observables. Our main results are
$f_D=186(29) \MeV$, $f_{D_s}=224(16) MeV$, $T_1=T_2=0.24(1)$, $B_K(NDR,
2\GeV)=0.67(9)$, and $B_8(NDR, 2\GeV)=0.81(1)$.

High Energy Physics - Lattice