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Features: 1. After installation, changed hex shank into square, which can be used for the installation of the sleeve. 2. Material: Chrome vanadium steel/CR-V. 3. Stainless steel locking ball ensures secure fit. Sockets snap-on tightly & won't slip off. 4. 1/4-inch hex shank prevents stripping during high speed drill operation. 5. Ultra-high temperature treated chrome vanadium steel, anti-impact. 6. Converts power drills into speedy socket drivers. 7. Applies to the screwdriver handle or electric screwdriver tools (hexagonal hole or three jaw chuck) driven sleeve. Size: 1/4" x 1/4" x 50mm--1/4" shank can be converted into 6.35mm square 3/8" x 1/4" x 50mm--1/4" shank can be converted into 9.53mm square 1/2" x 1/4" x 50mm--1/4" shank can be converted into 12.7mm square Package included: 3 x Drill Bits Adapter