Description: General Usage: This 8 piece 1/4" shank 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. Purpose: This adapter set is designed to provide a securely locked in extension to your existing tool. Provides additional length to reach into a multitude of hard to reach spaces. The spring ball lock ensures a tight fit into the driver head to prevent slipping during use. Specifically machined to fit securely into a hand held driver, drill driver or impact wrench. Durability: Quality is a guarantee with this 8 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 damage against elements and substances. Material: Chrome Vanadium Steel Specification: Color: Silver Size: 1/4": Approx. 6.35*6.35*25mm/0.25*0.25*0.98inch 1/4": Approx. 6.35*6.35*30mm/0.25*0.25*1.18inch 1/4": Approx. 6.35*6.35*50mm/0.25*0.25*1.97inch Length: 3-7cm/1.18-2.76inch Package Includes: 3/8Pieces Socket Bit Adapter Drill Nut Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be 1-2mm error in size.