Includes 6 sizes of screws: #6-48 TPI 6mm #6-48 TPI 8mm #6-48 TPI 10mm Includes 6 screws of each size plus Torx allen wrench. Screws crafted from hardened steel with Torx heads to prevent stripping. Included screw sizes cover compatibility with most common rifle receivers, scope rings, and gunsmithing applications. Check your hardware specs for confirmation before purchasing. All Monstrum products are backed by a lifetime guarantee