10 piece Durable Collet Nut Set #4485 Compatible for Dremel and other Rotary tools. Will Compatible for Dremel except discontinued Models 1, 2, and Series 1 or earlier of discontinued Models 260, 270 and 280. It also fits many other compatible rotary tools. Collets nuts are Compatible for Dremel 225 and compatible Flex-Shaft attachment. BRAND NEW and made of high quality material for reliable performance. | Durable and long-lasting for extended use. US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.