This product is anti-bending, anti-vibration and anti-scratch, super high-quality, not afraid of damage, can be used with confidence. High-density and precise production makes it tight and not easy to loose when connecting tools. It is a must-have accessory set for power drills and impact drivers. Hex shank is available to quick change and adjust collar with one hand, fits most common drill chucks and tools. The connecting rods in this set are made of high-quality vanadium alloy steel, which is hard and durable and can withstand huge weight. The surface of the connecting rod has been mirror polished, and the knurled design is not only beautiful, but also non-slip and corrosion-resistant. The card slot design at the joint is extremely practical. The extension rod has three specifications of large, medium and small, and the interface size is different, and a large number of tools can be applied. It is made of vanadium alloy steel. The connecting rod length is 1/4 inch (50mm, 100mm, 150mm), 3/8 inch (75mm, 150mm, 250mm), 1/2 inch (75mm, 100mm, 250mm). This bit holder is great for extending all kinds of screwdriver bits, drills, converts any variable-speed drill into a power screwdriver. Item Name: Sleeve Extension Rod Material:Chrome Vanadium Alloy Steel Style: Modern Type: Standard Size:27cmx9cmx3cm/10.63inx3.54inx1.18in Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 3 X 1/4 Inch Sleeve Extension Rod 3 X 3/8 Inch Sleeve Extension Rod 3 X 1/2 Inch Sleeve Extension Rod