FINE WORKMANSHIP: - The 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. SIZE: - 1/4" drive adapter, 3/8" drive adapter, and 1/2" drive adapter, each with a 1/4 inch hex shank driver socket wrench adapter set. 1/4" 3/8" 1/2" socket extension turn any power drill into a power nut driver.WIDE APPLICATION: -The impact driver socket adapter set can be widely applied to pneumatic screwdriver, electric screwdriver, pneumatic drill, manual screwdriver, air drill and more 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. Nice addition to your tool box set.EASY TO USE: -These socket adapter extension set is designed for impact use, featured with spring-loaded detent balls to hold sockets securely in place. Sockets Snap-On Tightly and Won't Slip Off.PREMIUM MATERIAL, LONG SERVICE LIFE: - This 3PCS impact grade drill socket adapter set is made of high-quality chrome vanadium steel (Cr-V), heavy-duty, sturdy and reliable; good product quality ensures long time use;