STEP 3 (Recommended for professional installers only.) Attach the under mount clips. Position bowl so that reveal is equidistant Then on underside of counter tap, drill holes for brass inserts of under mount clips. Use a drill bit with stop block to avoid drilling through the top. for 1/2* counter top material, drill 3/8" deep holes. Use three clips on the long sides of the sink, and two clips on the short sides of the sink, or follow the Locations on the template that comes with the sink.