countersinking
ˈkaʊntəsɪŋk
verb
enlarge and bevel the rim of (a drilled hole) so that a screw, nail, or bolt can be inserted flush with the surface.
drill and countersink the hole for mounting the ladder to the wall
verb
enlarge and bevel the rim of (a drilled hole) so that a screw, nail, or bolt can be inserted flush with the surface.
drill and countersink the hole for mounting the ladder to the wall