This ER16 collet chuck uses a 3/4 inch straight shank for TTS compatibility and accepts tool shanks from 3/16 to 1/2 inch in diameter via the ER16 collet. It is built for long service life and reliable performance in demanding machining tasks. - Durable construction: high strength steel body for extended service life. - Secure clamping: ER16 collet provides firm grip for precise, repeatable operations. - Wide compatibility: 3/4 inch straight shank supports standard TTS adapters and holders. - Flexible range: clamps tool shanks from 3/16 to 1/2 inch, covering common end mills and drills. Use scenarios - Milling aluminum or steel on a small CNC mill, using end mills up to 1/2 inch shank for pocketing and contouring with reliable retention. - Drill and mill tasks that require switching between small drills (as small as 3/16 inch) and end mills without changing holders. - Prototyping or fixture work in a shop, enabling quick tool changes and consistent clamping for repeatable finishes.