Features Advanced Material: The CNC milling cutter holder is made of high-quality carbon steel material, with high hardness and strength, ensuring the durability and stability of the product. Good Performance: After hardening and grinding, CNC straight shank collets have better durability and performance, effectively extending the service life. Professional Craftsmanship: The chuck shank is manufactured with professional craftsmanship, with high hardness, excellent workmanship, excellent performance and durability. Morse Shank: This is the MTB3 Morse shank, with good performance, high reliability, and easy installation and replacement. Application: ER40 has a large clamping range and is suitable for machining operations on various CNC lathes Specification: Item Type: Chuck Shank Holder Material: Carbon steel Model: MTB3-ER40 M12 Color: Silver + Black Package List: 1 x Chuck Shank Holder Package List 1 x Chuck Shank Holder