Our 23mm (0.91") diameter disc magnets can be fixed in place using adhesive or can be pushed into circular drilled holes in wood or plastic. Despite their relatively small size, they can generate a fantastic magnetic pull. For instance a 23mm (0.91") diameter x 20mm (0.79") thick magnet produces an astonishing pull of 16.5kg (36.38lbs). Making them popular for us in high-end engineering and manufacturing applications where compact size but maximum strength is required.