Feature: 1. 15 pieces in 1 set: The kit contains 15 pieces of different sizes of ER25 spring collets, suitable for different tightening scenarios. 2. Good performance: These pliers are small in size and fine in workmanship, with good elasticity and precision. 3. High speed steel: These spring clips 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 pliers are placed in a plastic box, which is convenient for storage and access at any time. Specification: Item Type: Collet Chuck Set Product Material: High Speed Steel Collet Model: ER25-1, 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 Product model: SKER2515PC03 Wrench size: approx. 8 x 30 x 138 mm / 0.3 x 1.2 x 5.4 inch Model Outer Diameter Approx. Inner diameter approx. ER25-1 26mm / 1in 1mm / 0.04in ER25-2 26mm / 1in 2mm / 0.08in ER25-3 26mm / 1in 3mm / 0.12in ER25-4 26mm / 1 in. 4 mm / 0.16 in. ER25-5 26 mm / 1 in. 5 mm / 0.2 in. ER25-6 26 mm / 1 in. 6 mm / 0.24 in. ER25-7 26 mm / 1 in. 7 mm / 0.28 in ER25-8 26 mm / 1 in 8 mm / 0.31 in ER25-9 26 mm / 1 in 9 mm / 0.35 in ER25-10 26 mm / 1 in 10 mm / 0.39 in ER25-11 26mm / 1in 11mm / 0.43in ER25-12 26mm / 1in 12mm / 0.47in ER25-13 26mm / 1in 13mm / 0.51in ER25-14 26mm / 1 inch 14 mm / 0.55 inch ER25-15 26 mm / 1 inch 15 mm / 0.59 inch Package List: 1 x ER25-1 Collet 1 x ER25-2 Collet 1 x ER25-3 Collet 1 x Collet ER25-4 1 x ER25-5 collet 1 x ER25-6 collet 1 x ER25-7 collet 1 x ER25-8 collet 1 x ER25-9 collet 1 x ER25-10 collet 1 x ER25-11 collet 1 x ER25 collet 12 1 x ER25-13 Collet 1 x ER25-14 Collet 1 x ER25-15 Collet 1 x Wrench Note: 1. Make sure to keep the same size of the collet and extension rod. 2. Due to manual measurement, please allow 1-3mm error. 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.