Features: Features uniformly distributed grooves on the extension rod, enabling easy adjustment from 270-500mm to accommodate diverse height needs. Equipped with clear measurement indicators for precise length adjustments, enhancing user convenience. Includes 10mm, 13mm, 14mm, and 17mm replaceable attachments, ideal for various bolt size to boosts work efficiency. Works with both square and hexagonal shafts adapters, making it suitable for use with electric drills and impacts devices. Constructed for stability, ensuring reliability and maintaining its form during use, perfect for various woodworking applications. Specifications: Size: adjustable 270-500mm Sleeve: 10mm, 13mm, 14mm and 17mm Suitable for: electric drill, electric wrenches Component:Metal Package Includes: 1 Set Metal Framing Sleeve note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.