FINE WORKMANSHIP: - Excellent surface coating provides extra protection from damage against elements and substances such as oil and fluids that may come in contact with the extension bars during use. 360 DEGREE ROTATABLE - 3PCS SOCKET ADAPTER: - 360 degree rotatable socket adapter adopts a special spherical design, which can evenly distribute the torque load on a greater surface area; Allow access to a narrower workplace, convenient to use, effort-saving, significantly improves work performance;1/4" driver adapter, 3/8" socket adapter, and 1/2" impact adapter, each with a 1/4-inch hex shank driver socket wrench adapter set, turning any power drill into a power nut driver;DURABLE TOOL ACCESSORIES: - This 4 PCS drill bit extension quick release socket adapter set is made of premium high-strength chrome-vanadium steel, sturdy, wear-resistant, corrosion-resistant, withstanding high pressure;QUICK RELEASE SOCKET ADAPTER: - Socket Adapter: 1/2 Inch Square Female to 1/4 Inch Hex Female- Securely holds any 1/4" hex-shank bit; Quick-load and release mechanism provides one-handed bit loading lock; WIDELY-USED: -In installation of pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver and other installation for the hexagonal tool . A must-have package for conversion. Great for DIY work, household maintenance, and most general repairs, not for industrial work. A great tool addition to any tool box set.