PACKAGE CONTAINS: 3 piece 1 of each Size: 1/4" 3/8" 1/2" Turns any power drill into a power nut driver Sturdy spring-loaded ball bearing holds sockets securely in place Sockets Snap-On Tightly and Won't Slip Off.Material:Chrome Vanadium Steel for home use - Specification: Sockets Standard 1/4" hex shank to 1/4" 3/8" 1/2" socket & 1/4 " shank can be converted to 1/4" 3/8" 1/2" square head.Easy to Choose: Different colour coded rings, make it easy to pick the right one. DESIGN: The Shaft Quick Change Hex Design allows to switch easy & fast between the different size adapters without stripping at high speed operations Sandblasted Finish for best durability - Spring Loaded Extension Ball Bearings holds onto the sockets securely preventing fall-offs. General Usage: This 3 piece Hex Shank Bit Driver Extension Bar Set is designed to meet a variety of needs. Fits snugly and securely in your drill chuck or hand held driver. Consisting of your most common bit sizes 1/4", 3/8", and 1/3" changing shank sizes. Provides versatility and convenience no matter which tool you chose to use. Great for the , household maintenance, and most general repairs, not for industrial work. A great tool addition to any tool box set. Durability: Quality is a guarantee with this 3 piece sturdy and durable solid steel set designed to withstand torque compression under most standard use situations. The exterior anti-weathering coating provides extra protection from against elements and substances such as oil and fluids that may come in contact with the extension bars during use with repairs such as in the automotive field.