High quality materialThe speed drill chuck is made of high quality plastic and chrome vanadium steel, high hardness, durable in use, which is strong, wear resistant, not easy to break. rust and has a long service life. Easy to InstallThis keyless chuck converter can easily convert an electric screwdriver into a drill or grinder. Easily lock and unlock the drill bit without the need for a key. Simply click the chuck into the hammer drill, small and portable, improve work efficiency. Not easy to loosenSpecial processing of the jaw with good abrasion resistance. The keyed chuck has built-in anti-thrust bearings that convert hand-applied torque into excellent grip and prevent loosening caused by heavy vibration. < p>Multifunctional drill chuck1 drill chuck + 1 air pack adapter, the keyless manipulation of the drill chuck allows easy operation and quick clamping of the drill. It not only saves time, but also helps with safety when clamping round and hex shank drills into the chuck. Versatile ApplicationsThese drill chucks come in different sizes, suitable for hammer drills, impact drills , power drills, gear chucks, drilling, clamping, most cordless drills and screwdrivers. Can be used for routine maintenance, auto repair, garage, warehouse, office, home, etc. Quick change SDS shank designed for electric hammer, built with everything metal for supreme durability It has a locking function, strong clamping force, effectively preventing drill bits from coming off, more reliable. Only tighten the adapter of rotation to prevent hammer blows and other high vibration when work is released. Finger clamping of keyless chuck could quickly change drill and screwdriver bits. Comfortable jacket surface, with strong grip, easy to grip, which increases the output torque. Unique thrust bearing, the torque applied to the handle is easy to translate into more gripping force important. Specification: Material: chrome vanadium steel Hole diameter: 12 mm Clamping range: 2 -13mm Mounting thread: 1/2-20UNF Scope of application: suitable for the power of 1050W above the impact drill.