Wot e said.
And those 4 mm screws will still tighten up fine if it's a shade out.
In a more industrial setting, there's the "drill bushing":
which is a hardened steel guide which is installed in a jig. It takes the wear of guiding the spinning bit. They also come in different inner hole diameters with the same outer diameters, allowing one to swap bushings to accommodate different drill bit diameters.
Thomas Prufer