✔It is suitable for applying to MT3 ER32 M12 special machine tools, CNC milling lathe tools, and work-holding engraving machines, which are widely used in parts machining, precision engineering, mold modification, repair service, and other fields. It is ideal for professionals and hobbyists demanding. ✔Equipped with 15 different sizes of ER32 collets(0.12in, 0.16in, 0.20in, 0.24in, 0.28in, 0.31in, 0.35in, 0.39in, 0.43in, 0.47in, 0.51 in, 0.55in, 0.63in, 0.71in, 0.79in) ✔High Precision: The product ensures precise positioning of workpieces during machining, with a combined accuracy of up to 0.0008 inches, which is suitable for various operations such as milling, drilling, tapping, and other relevant tasks, ensuring quality results every time. Details  ✔Comfortable Handle: The BT ER extended bar handle is ergonomically designed to provide you with a comfortable grip. ✔Suitable Grooves: The storage box is designed with suitable grooves, which is convenient for you to categorize and scientifically store the sleeves, collets, and handles. Specification Mount Type: Freestanding Assembly Required: Yes Number of Collets: 15 Material: Metal, Spring Steel MT3 ER32 M12 Collet Chuck Size: 13.8cm/5.43in Spindle Drawbar Thread: M12*1.75 ER32 Clamping Range: 1-20mm/0.04-0.79in Spanner Size: 212mm/8.35in ER32 Spring Collet Set: Color: Steel Color Type: ER32 Length: 40 mm/1.57in Diameter: 32 mm/1.26in Inner Diameter: 3mm/0.12in, 4mm/0.16in, 5mm/0.20in, 6mm/0.24in, 7mm/0.28in, 8mm/0.31in, 9mm/0.35in, 10mm/0.39in, 11mm/0.43in, 12mm/0.47in, 13mm/0.51 in, 14mm/0.55in, 16mm/0.63in, 18mm/0.71in, 20mm/0.79in Combined Accuracy: 0.02mm/0.0008 in Package include 1* MT3 ER32 M12 Collet Chuck 15* ER32 Spring Collets 1* Spanner1* Storage Box Note 1. Please check the style and size before purchasing. 2. Please note that the collet must be assembled into the clamping nut(not included) before inserting it into the chuck. 3. Please measure the collet deviation before using the collet. If the collet deviation accuracy exceeds 0.0004 inches, please correct it before cutting. 4. The collet extension time is longer when the collet shortens the chuck length as much as possible. If it is extended, please reduce the speed, feed rate, or cutting volume by yourself. 5. If abnormal vibration or sound occurs during cutting, please reduce the spindle speed and depth of cut.