We characterize the pairs of weights («, v) for which the maximal operatoris of weak and restricted weak type (p, p) with respect to u(x) dx and v(x) dx. As a consequence we obtain analogous results for
R>0 JR<\X-y\<2RWe apply the results to the study of the Cesбro-a convergence of singular integrals.2000 Mathematics subject classification: primary 42B25; secondary: 42B20,42B08.