Description: 10pcs 4-13mm Spring Collet Chuck Set For CNC Milling Machine Engraving Lathe Tool. Specification: Material:Spring Steel; Accuracy:0.015mm (0.0006 "); Gripping range:4 to 13mm (4mm / 5mm / 6mm / 7mm / 8mm / 9mm / 10mm / 11mm / 12mm / 13mm); Height:31.5mm / 1.24"; OD:21mm / 0.82"; Overall Quantity:10pcs. Features: - 10pcs / set spring clamping set for CNC Workholding engraving and milling lathe tool. - Includes 4mm / 5mm / 6mm / 7mm / 8mm / 9mm / 10mm / 11mm / 12mm / 13mm, which can meet your need. - Made of high quality 65Mn spring steel, stable in performance. - Clamping force, good elasticity, high precision, wide clamping range - Widely used, boring, milling, drilling, silk attack, sculpture, CNC, and other processing. - Use with any standard ER chuck for cooling tool applications. - Each collar is well packaged in a separate protective container with label. Note: The collar must be placed in the clamping nut before inserting it into the chuck. Package Included: 10pcs x Collets. Notice: 1. Please allow a bit error due to manual measurement. please make sure you do not mind before you bid. 2. The color may have different as the difference display, pls understand