  Non-perturbative results for improvement and renormalization constants needed
for on-shell and off-shell O(a) improvement of bilinear operators composed of
Wilson fermions are presented. The calculations have been done in the quenched
approximation at beta=6.0, 6.2 and 6.4. To quantify residual discretization
errors we compare our data with results from other non-perturbative
calculations and with one-loop perturbation theory.
