Features: _x000D_Made of high grade specially formulated spring steel. _x000D_Hardened and precision ground. _x000D_Built in self-release design and tools will never get stuck in holder. _x000D_Big clamping force and wide clamping range, widely used in machining centers,general milling machines, CNC milling machine, engraving machine, high-speed machines, and other processing. _x000D__x000D__x000D_Package Included: _x000D_10 x Spring Collet 1Made of high grade specially formulated spring steel 2Hardened and accuracy ground 3Built in self-release design and tools will never get stuck in holder 4Big clamping force and wide clamping range, widely used in machining centers, general 5This ER16 collet set is for CNC milling lathe tool and work-holding engraving machine.