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Product name: ER11 collet nut set, includes 1/8 inch collet, 1/4 inch collet and 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 : Widely used in CNC, milling machines, engraving machines, machining centers and other equipment Package content: 3 pieces ER11 collet nut set ( 1/8'' collet + 1/4'' collet + clamping nut )