Item Type: Collet chuck tool holder Model: BT40-ER20-100 Clamping Range: Approx. 1-13mm / 0.04-0.5in L Length: Approx.100mm / 3.9in Material: 40cr 1,Made of 40cr alloy steel, the product can withstand high pressure and explosion. 2,The collect chuck tool holder is featured with quality assurance, long service life. 3,With excellent price and high cost performance, the product is a good choice for you. 4,The tool is characterized by high accuracy and excellent performance. 5,You can use this collect chuck tool holder on various kinds of CNC milling machines.1 x Collet Chuck Tool Holder Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.