Features Rectangular Structure: The rectangular rod structure is more sturdy and reliable, which provides better clamping force for test dial indicator, and ensures the stability of the measuring tool. Aluminum Alloy: The test dial indicator holder bar is made of excellent aluminum alloy material, which has high strength and good durability, and can maintain stability during long term use. 100mm Connection Rod: The length of the connecting rod is 100mm, which can meet most measurement needs and facilitate precise measurement by users, easy to install and disassemble. 6mm 8mm Hole Diameter: This holder bar is equipped with 2 clamping hole diameters of 6mm and 8mm, which are suitable for different measuring tools, provide a wider range of applicability. Convenient Use: This aluminum alloy extension rod clamp is lightweight and compact, convenient to use and carry, and can help users flexibly use it in various working environments. Specification: Item Type: Dial Test Indicator Bar Material: Aluminum Alloy Connection Rod Length: Approx. 100mm / 3.9in Rod Handle Diameter: Approx. 9 x 9mm / 0.35 x 0.35in Clamping Hole Diameter: Approx. 6mm / 0.24in, 8mm / 0.31in Package List:1 x Dial Indicator Holder Bar Package List 1 x Dial Indicator Holder Bar