The 18PCS/Set ER32 3-20mm Spring Collets Set + MT3-ER32 Collet Chuck is a high-quality metalworking equipment set designed for CNC, metalworking, and manufacturing industries. This unbranded/generic set includes various spring collets in sizes ranging from 3mm to 20mm, as well as a MT3-ER32 collet chuck. The set is perfect for businesses and industrial applications, offering a range of sizes to suit different machining needs. Made in China, this set is a reliable and efficient addition to any metalworking setup.