Feature: 1. 15Pcs in 1 Set: The kit contains 15pcs of different sizes of ER25 spring collets, suitable for different clamping scenarios. 2. Good Performance: These collets are small in size, and has fine workmanship, with good elasticity and accuracy. 3. High Speed Steel: These spring collets are made of high speed steel metal material, which has high hardness and wear resistance. 4. With Wrench: The kit is equipped with a wrench for easy installation and adjustment of the chuck without additional tools. 5. Convenient Storage: These collets are placed in a plastic box, which is convenient for storing and accessing at any time. Specification: Item Type: Collet Chuck Set Product Material: High speed steel Collet Model: ER25-2, ER25-3, ER25-4, ER25-5, ER25-6, ER25-7, ER25-8, ER25-9, ER25-10, ER25-11, ER25-12, ER25-13, ER25-14, ER25-15, ER25-16 Product Model: SKER2515PC03 Wrench Size: Approx. 8 x 60 x 210mm / 0.3 x 2.4 x 8.3in Model Outside Diameter Approx. Inside Diameter Approx. ER25-2 26mm / 1in 1mm / 0.04in ER25-3 26mm / 1in 2mm / 0.08in ER25-4 26mm / 1in 3mm / 0.12in ER25-5 26mm / 1in 4mm / 0.16in ER25-6 26mm / 1in 5mm / 0.2in ER25-7 26mm / 1in 6mm / 0.24in ER25-8 26mm / 1in 7mm / 0.28in ER25-9 26mm / 1in 8mm / 0.31in ER25-10 26mm / 1in 9mm / 0.35in ER25-11 26mm / 1in 10mm / 0.39in ER25-12 26mm / 1in 11mm / 0.43in ER25-13 26mm / 1in 12mm / 0.47in ER25-14 26mm / 1in 13mm / 0.51in ER25-15 26mm / 1in 14mm / 0.55in ER25-16 26mm / 1in 15mm / 0.59in . Package List: 1 x ER25-2 Collet 1 x ER25-3 Collet1 x ER25-4 Collet1 x ER25-5 Collet1 x ER25-6 Collet1 x ER25-7 Collet1 x ER25-8 Collet1 x ER25-9 Collet1 x ER25-10 Collet1 x ER25-11 Collet1 x ER25-12 Collet1 x ER25-13 Collet1 x ER25-14 Collet1 x ER25-15 Collet1 x ER25-16 Collet 1 x Wrench Note: 1. Be sure to keep the size of the collet and extension rod the same.2. Due to manual measurement, please allow an error of 1‑3mm.3. When the tool is inserted into the inner hole of the collet, it must exceed the effective holding length of the inner hole to avoid damage caused by improper use.4.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.