Specifications: Precisely engineered M40x1.5 thread fits standard ER32 collets, ensuring stable and reliable performance in your tool holder applications. Compatibility: Designed for ER32 collets, these clamping nuts are versatile and compatible with a wide range of tool holders, making them ideal for lathes and engraving machines. Dimensions: Perfectly sized with a 49.5mm outer diameter and 27mm inner bore to guarantee secure clamping and easy installation in precision tools. Material: Crafted from metal, these clamping nuts are built to withstand frequent use and high-speed operations, offering long-lasting durability. Applications: Perfect for use with lathes, engraving machines, and other CNC systems, delivering reliable clamping for accurate and efficient machining., Manufacturer: LT Easiyl