Key Features Build to Last: Made of spring steel with turning, milling, and grinding processes, this set of products is scratch-resistant, abrasion-resistant, impact-resistant. Multiple Sizes: The shank comes with 9 collets of different sizes to hold different sizes of tools for different workpieces and machining needs. Easy to Carry and Store: The shank and each collet come in labeled cases, making it easy to store and carry them. Application The product is suitable for holding milling cutter, drill bit, and straight shank tools for boring, milling, drilling, tapping, engraving, CNC, spindle machines, machining centers, general milling machines, and other machining. Specifications Color: Silver Material: Spring Steel Process: Turning, Milling, Grinding Shank Type: MT3 Collet Type: ER32 Drawbar Thread: M12 Assembly Required: Yes Collet Inner Diameter: 2mm/0.08in, 4mm/0.16in, 6mm/0.24in, 8mm/0.32in, 10mm/0.39in, 12mm/0.47in, 16mm/0.63in, 18mm/0.7in, 20mm/0.79in Collet Outer Diameter: 33mm/1.3in Collet Length: 40mm/1.57in Shank Size: 50*140mm/1.97*5.5in Tail Hole Diameter: 19mm/0.75in Package Size: 20*17*10cm/7.87*6.69*3.94in Gross Weight: 2kg/4.41lbs Net Weight: 1.9kg/4.19lbs Package Included 9* Collets 1* Shank Notes 1.Please check the size carefully before ordering. 2.Before using this tool, please measure the deviation of the tool. If the deviation of the tool is more than 0.05mm, please correct it before cutting. 3.Minimize the amount of tooling that extends beyond the chuck. If the tool exceeds the chuck too much, reduce the cutting speed, feed rate, or depth of cut to maintain tool life and machining accuracy. 4.If abnormal vibration or sound occurs during cutting, reduce the spindle speed and depth of cut to improve the current condition.