Features 300mm Extension Rod: The length of this dial test indicator extension rod is 300mm, which can meet most measurement needs and facilitate accurate measurement by users. Rectangular Structure: The rectangular rod structure is sturdy, providing better clamping force, quickly fixing and clamping the dial indicator, ensuring the stability of the measuring tool. Aluminum Alloy: The dial indicator holder bar is made of excellent aluminum alloy material, which has high strength and good durability, can maintain stability during long term use. 6mm 8mm Clamping Hole: The dial gauge clamp is equipped with 6mm and 8mm clamping hole diameter, for measuring tools with different diameters, providing 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 Indicator Rod Clamp Material: Aluminum Alloy Connection Rod Length: Approx. 300mm / 11.8in 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 Rod Clamp Package List 1 x Dial Indicator Rod Clamp