1SPECIFICATIONS: Includes 12pcs ER11 spring collets, with different sizes to meet more needs, and each collet is equipped with a storage box. 2ALLOY STEEL: These collets are made of excellent alloy steel with high strength and good flexibility, which is not easy to deform or wear. 3HIGH ACCURACY: Fine grinding treatment inside and outside ensures smoother collet slot position, higher accuracy and good stability. 4CONCAVE TABLE: The front of the collet cone has concave table design to prevent dust from entering during work and affecting machining. 5ADVANTAGES: These spring collets have the advantages of large clamping force, strong versatility, good surface finish, small tolerance range. 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 12 x ER11 Collets 12 x Storage Boxes