quality ERseries collet chuck system designed for accurate, reliable tool holding on lathes and CNC machines. This spring collet tool holder with AA shank delivers secure clamping and fast tool changes for milling, drilling, engraving and tapping operations. Available in ER11, ER16, ER20, ER25 and ER32 sizes — this listing is the ER25 AA 15PCS pack. Why you need it Stable, concentric grip reduces tool runout and improves surface finish and hole accuracy. Springstyle ER collets accommodate a range of tool diameters for flexible tooling without changing holders. AA shank design fits standard tool posts and CNC spindles that accept AAstyle tool holders, simplifying integration into existing setups. Key benefits Versatile: Use one holder with a series of ER collets to cover many tool sizes, minimizing inventory and setup time. Fast tool changes: Collet system allows simple assembly and disassembly for rapid swapping of cutters, drills, and taps. Reliable clamping: Spring collet design provides even radial pressure for secure and repeatable tool holding. Key attributes Series: ER collet chuck (ER11 / ER16 / ER20 / ER25 / ER32 available) Specific model/pack: ER25 AA 15PCS Shank type: AA Collet type: Spring ER collet Applications: CNC milling, lathe turning, drilling, engraving, tapping Typical applications CNC milling: Hold end mills and cutters securely for profiling, slotting and finishing operations where concentricity and stability matter. Drilling and tapping: Accurate tool alignment for repeatable holemaking and threaded holes on lathes and machining centers. Engraving and precision work: Stable clamping for smalldiameter cutters used in engraving, PCB milling and finedetail machining. What's included (as listed) ER25 AA 15PCS pack (ER25 AA configuration in a 15piece set as specified in the product title) Usage and care Install and tighten according to your machine/toolholder manufacturer's guidelines. Clean collet and chuck contact surfaces before assembly to maintain concentricity and prevent damage. Inspect collets regularly for wear or deformation and as to ensure continued accuracy and safety. Compatibility notes Designed to work with ERseries collets and tools sized for the specified ER range. AA shank form factor fits machines and tool posts that accept AAtype holders. For other ER sizes, select ER11, ER16, ER20, ER25 or ER32 variants as listed. Practical advantages Reduces downtime by enabling quick tool swaps and broad diameter coverage with one holder type. Simplifies tooling management in small shops and production environments by using standardized ER collets. Improves final part quality through consistent, repeatable clamping during milling, drilling, engraving and tapping.