ALL-CARB 2Pcs CAT50-ER32-100 Collet Chuck, 4 Inch Extension Collet Chuck Tool Holder Set, for CNC Engraving Machine and Milling Lathe Tool

Gauge Length: 100mm (4 inches), ER nut: ER32-UM, pull rod thread 1 Inch-8, default balance: G2.5/25000RPM Stable: The chuck chuck is integrally grinded, with high concentricity, high body accuracy, and stable accuracy at high speed Heat Treatment: The vacuum quenching furnace is used for heat treatment to improve the hardness of the tool handle, which can effectively eliminate the residual internal stress in the grinding process Convenient Replacement: The v-shaped groove is designed to be balanced, meet the requirements of industrial standards, facilitate tool replacement, and reduce the maintenance of the spindle and tool replacement Purpose: CNC lathe/milling machine, drill and heavy hand tools