Feature: 1. 18Pcs in 1 Set: The kit includes 18pcs ER32 spring collets, the use range is 3‑20mm, to meet various clamping needs. 2. Made of Carbon Steel: Made of excellent carbon steel material, with high hardness and wear resistance, can be used for a long time. 3. Good Performance: These spring collets have large clamping force, high accuracy, wide clamping range and strong practicability. 4. Multiple Usages: Suitable for CNC, engraving machine and other equipment, used for milling, boring, drilling, wire tapping and other operations. 5. With Storage Box: These collets are placed in a storage box, which is convenient for storing and accessing at any time. Specification: Item Type: ER32 Spring Collet Collet Material: Carbon steel Wooden Box Material: Laminated wood Product Model: ER32 Product Height: Approx. 40mm / 1.6in Product Diameter: Approx. 33mm / 1.3in Use Range: Approx. 3-20mm / 0.1-0.8in Scope of Application: Suitable for CNC, engraving machine and other equipment. Used for milling, boring, drilling, tapping and other operations. Package List: 18 x Spring Collet1 x Storage Box