About this item Fits 1/4" quick change chuck systems or direct to chuck / Converts any electric/cordless drill into an electric nut driver / Convenient for quickly driving in nuts, bolts and fasteners etc. Holds sockets securely. [Included] 3 piece extension set 1/4 3/8 / 1/2" and 4" socket adapter 1/4 to 3/8 - 3/8 to 1/4 - 3/8 to 1/2 - 1/2 to 3/8 pieces. Provides versatility and convenience , whatever tool you choose to use Ideal for DIY, home maintenance and most general repairs , not industrial work A great addition to any toolbox. 4-piece 1/4 - 1/2 inch adapter set (connecting part) Suitable for all types of ratchet, ratchet, socket wrench, torque wrench, handle, etc. Design of passivation: the two passive tips install quickly, they are also easy to disassemble.