This optic screw pack contains 3 of just about any and every screw you could want... This optic screw pack works with all Cyelee open emitter optics 6-40 - 12.7mm 6-40 - 9.5mm 4-40 - 9.5mm 4-40 - 8mm 4-40 - 6.35mm 6-48 - 8mm 6-48 - 9.5mm 6-48 - 11.1mm 6-32 - 8mm 6-32 - 9.5mm 6-32 - 11mm 6-32 - 12mm M3 - 9mm M3 - 12mm M3.5 - 11mm M4 - 8.6mm M4 - 10.1mm This optic screw pack ships via USPS only.