115Pcs in 1 Set: Including 15pcs ER25 spring collets, with different clamping ranges to meet various clamping needs. 2Good Performance: These collets are small in size, and have fine workman, with good elasticity and accuracy. 3Carbon Steel Material: Made of carbon steel material, with heat treatment and fine grinding process, wear resistant and durable. 4Wide Clamping Range: The clamping range of these spring collets is 216mm, and the clamping force is large. 5Applicable Scenes: Commonly used in CNC, engraving machine and other equipment, used for milling, boring, drilling, wire tapping, etc. Item Type: ER25 Spring Collet Collet Material: Carbon steel Wooden Box Material: Laminated wood Product Model: ER25 Product Height: Approx. 34mm / 1.3in Product Diameter: Approx. 26mm / 1in Use Range: Approx. 2-16mm / 0.1-0.6in Scope of Application: Suitable for CNC, engraving machine and other equipment. Used for milling, boring, drilling, tapping and other operations 15 x Spring Collet 1 x Storage Box