Euro Hinge Jig-Concealed Hinge Jig, Suitable for Frame and Frameless Cabinet Door Hinges 35mmMfr #: 1342 Two edge alignment knobs position the cup hole from the edge of the door, while the edge pin sets the distance from the top bottom. The drill guide with metal bushing locks into jig and creates a perfectly straight hinge cup hole Guide bushings built into body of drilling jig leta you pre drill pilot holes in 4 common locations, making sure hinges are straight and door closes true. The 1 16" diameter drill bit for pilot holes is included.