115Pcs in 1 Set: The kit contains 15pcs of different sizes of ER25 spring collets, suitable for different clamping scenarios. 2Good Performance: These collets are small in size, and has fine workman, with good elasticity and accuracy. 3High Speed Steel: These spring collets are made of high speed steel metal material, which has high hardness and wear resistance. 4With Wrench: The kit is equipped with a wrench for easy installation and adjustment of the chuck without additional tools. 5Convenient Storage: These collets are placed in a plastic box, which is convenient for storing and accessing at any time. Item Type: Collet Chuck SetProduct Material: High speed steelCollet 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, ER25-16Product Model: SKER2515PC03Wrench 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 26mm / 1in Note 26mm / 1in