This is a replacement truss rod cover, an aftermarket part imported from overseas. It's made to replicate Gibson vintage covers, roughly from the '59 to early '60s. In other words, it recreates the thin black top layer and the thicker, slanted white layer. Of course, there's no "roll mark" on the black top, but it's quite thin. It's no exaggeration to say it's equivalent to the covers included with recent Historic Collection guitars. Like those Historics, it has a slightly slimmer impression. It's a cut above the bulky regular versions. Unlike the jagged and unsightly white parts made by MONTREUX, this has a very realistic level of detail. Please see the images for the screw hole spacing. Mounting screws are included.