Features 1、Extension Rod and Wrench: This kit includes a straight shank extension rod and a chuck wrench, with fine workmanship and standard sizes, suitable for ER16M chuck. 2、Manganese Steel: This extension rod is made of excellent manganese steel, with quenching and blackening, ensuring strong oxidation resistance and high hardness. 3、Straight Shank: The chuck extension rod is designed with a straight shank, suitable for deep hole machining, and clamping the nut makes your work more efficient. 4、For ER16M Chuck: The straight shank extension rod and wrench are good replacement parts for ER16M chuck, and can directly replace old or damaged ones. 5、Convenient Use: The chuck extension rod is compact and lightweight, easy to install and disassemble, with strong practicality, widely used in CNC milling projects. Specification Item Type: Chuck Extension Rod Model: C20-ER16M-135L, ER16M Material: Manganese Steel Package List 1 x Extension Rod 1 x Wrench 1 x Storage Box