Features Comprehensive 12-Piece Set: Includes 12 different sizes of ER11 spring collets, catering to various machining needs while ensuring convenient organization in a dedicated storage box Durable Alloy Steel Construction: Crafted from high-quality alloy steel, these collets offer exceptional strength and flexibility, resisting deformation and wear for long-lasting performance Enhanced Precision: Fine grinding treatment on both inner and outer surfaces ensures precise collet slot positioning, delivering superior accuracy and stability during CNC operations Innovative Concave Table Design: The unique concave shape at the collet's front prevents dust and debris from entering, maintaining a clean working environment and enhancing machining quality Strong Clamping Force and Versatility: These spring collets provide a large clamping force with a minimal tolerance range, ensuring a great finish and compatibility with various CNC tools and engraving machines Features: 1、SPECIFICATIONS: Includes 12pcs ER11 spring collets, with different sizes to meet more needs, and each collet is equipped with a storage box. 2、ALLOY STEEL: These collets are made of excellent alloy steel with high strength and good flexibility, which is not easy to deform or wear. 3、HIGH ACCURACY: Fine grinding treatment inside and outside ensures smoother collet slot position, higher accuracy and good stability. 4、CONCAVE TABLE: The front of the collet cone has concave table design to prevent dust from entering during work and affecting machining. 5、ADVANTAGES: These spring collets have the advantages of large clamping force, strong versatility, good finish, small tolerance range. Specification: Item Type: ER11 Collet Set Material: Alloy Steel Collet Size: 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 6.0mm, 7.0mm, 8mm, 1/8in, 1/4in Package List: 12 x ER11 Collets 12 x Storage Boxes Package List 12 x ER11 Collets 12 x Storage Boxes