Drill a hole 7/16" deep for the 3/8" size (or 9/16" deep for the 1/2" or 3/4" sizes), spread a drop of glue on the wall of the hole, and knock in the hinge. The hinge is invisible in use.
For glue-bond strength and best fit, we recommend that forstner bits be used for drilling the required flat-bottomed hole.
Made in USA.