This 13 pcs ER20 collets are suitable for boring, milling, drilling, tapping, engraving, CNC, spindle machines and similar jobs. The set is with 1 mm to 13 mm griping range. These collets are made of high-quality steel, stable and practical in performance. It works with high precision, good elasticity and shock resistance. The set is built in self-release design and tools do not get stuck in the holder. Each collet is well packed in a separate protective container with a label. Also, each collet is marked with size, so it\'s easy to identify them.