  We obtain upper and lower bounds for Steklov eigenvalues of submanifolds with
prescribed boundary in Euclidean space. A very general upper bound is proved,
which depends only on the geometry of the fixed boundary and on the measure of
the interior. Sharp lower bounds are given for hypersurfaces of revolution with
connected boundary: we prove that each eigenvalue is uniquely minimized by the
ball. We also observe that each surface of revolution with connected boundary
is isospectral to the disk.
