- High quality material: made of durable high-speed steel (HSS) to deliver high strength and hardness for long lasting use. - Easy to use: 5 mm diameter extension rods that fit easily with interchangeable tools such as dial indicators and depth gauges. - Versatile application: suitable for dial indicators, altimeters, and depth gauges, providing accurate and reliable measurements. - Multiple length options: set includes 5 extension rods in 20 mm, 40 mm, 60 mm, 80 mm and 100 mm lengths for flexibility with different measuring needs. - Use scenarios: - Extend reach for dial indicators to measure features in tight or recessed areas on workpieces. - Use with depth gauges to access deep or obstructed measurement points in fixtures or setups. - Configure height references in inspection jigs or with altimeters to achieve precise positioning.