Features: Selected from stainless steel, which can withstand repeated use and demanding working conditions. It has a long service life and has vibration and shock absorption functions to reduce the impact of vibration on the equipment A fixed clamp holder is used, which allows a firmer and more attachment. The two screws on the extension rod can be tightened ensure a stable and secure attachment without loosening. Suitable for milling drills, especially for deep hole milling and openings. Especially suitable for installation work, pipe feedthroughs and window constructions to facilitate drilling in wood. Good rotation flexibility, it can easily rotate and adapt to different working environments to increase work efficiency. Specifications: Component:Stainless Steel Length:169mm/178mm/254mm Package Includes: 1Pc Drill Extension note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.