Made of high quality materialsMade of high quality chrome vanadium steel materials, surface sandblasting, strong resistance to rust and corrosion, high temperature quenching treatment improves durability and life life. Product DesignHexagonal handle design, 1/4" shank fits most corded or cordless motorized drills. Easy to set up and take down, no not easily fall out during use. Kit includes9 hex sockets include: 5mm 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm . Wide ApplicationSuitable for household DIY, woodworking, auto parts, professional machine repair, etc. Widely used in those hex tools such as pneumatic screwdriver, electric screwdriver, drill pneumatic, electric drill, gun drill, hand screwdriver, etc. Customer ServiceIf you have any problem s of quality or use, you can contact S I would be happy to contact us. We will reply to you as soon as possible and provide our customers with the best service.