Concealed hinge boring tool. For use with standard 3/8" electric drill motor or drill press. Can be mounted on a drill press and removed at any time for field situations and then easily reinstalled on the drill press. Features automatic boring depth stop, a non-skid base to protect the work piece, centerline positioning for additional hinge boring and can drill for leg leveler systems. Uses standard 20mm, 35mm or 40mm x 57mm boring bits, not included.. For custom size cabinetry as well as the 32mm system making it usable on all brands of hardware.