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Product name: ER11 precision collet nut set, includes 2 pieces ER 1/4 inch collet and ER11 clamping nut Materials: Collet are made of 65Mn spring steel,with high precision,high elasticity, tight clamping and stable cutting High precision: Collet precision is AAA level and less than 0.008mm,used for milling, boring, drilling, wire tapping and other operations Application : ER11 collet nut set is widely used in CNC, milling machines, engraving machines, machining centers and other equipment