The COL ER SET ER20, 12 PIECE from Field Tool Supply is a comprehensive collet set designed for precision machining. This set includes 12 collets, each compatible with ER20 tool holders, making it ideal for a variety of milling and drilling applications. Constructed from high-quality steel, these collets provide excellent grip and stability, ensuring accurate tool positioning. The ER20 collet system is widely used in CNC machines, offering versatility for different tool sizes. This set is perfect for machinists looking to enhance their tool collection with reliable and durable collets.