1、HIGH CARBON STEEL MATERIAL: These spring collet chucks are made of high carbon steel, sturdy and durable, with stable performance and convenient use. 2、APPLICABLE SCENARIO: Suitable for clamping grinding heads on various grinding machines, suitable for repairing and grinding tires. Compatible with most rotating tools used in hardware, hobbies, home, and more. 3、WIDELY APPLICABLE: Widely used in machining centers, ordinary grinding machines, CNC grinding machines, engraving machines, high speed machines, and other processing. 4、FINE WORKMANSHIP: The four jaw structure provides good contact and stronger grip. Ideal replacement for the old and damaged parts for better performance! 5、EASY TO INSTALL: Comes with a small size and a lightweight as well, can be easily carried and installed for convenient use.