49.2mm String Spacing. Very nice quality. Hand selected and hand polished by Steve to remove most of the artifacts from the manufacturing process like small acid stains and very fine scratches. Fits most standard old '50s-'80s Gibson spaced humbuckers, Lindy Fralin Gibson spaced humbuckers and many other vintage Gibson spaced humbuckers exactly. These are 'old school' covers for use on vintage humbuckers where the neck and bridge pickup have the same pole spacing. I measured 49.2mm/1.937" E to E centers. Made In Korea by a factory that does quite a bit of work for Fender and other major guitar companies.