Improve the grip for bits in your Dremel® rotary tool with a genuine Dremel® collet set The set includes 480, 481, 482, 483 collets, plus a quick-change collet nut, allowing you to easily use a wide range of bits It is also compatible with Flex-Shaft tool hand-pieces #235 and #237 The metal shanks are made of metal for long-lasting use, while the collets feature small identification rings around its shank to differentiate among the sizes