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Brief introductionPrecision 0.008mm ER Collet with DIN6499, also known as spring collet, is mounted on a drill milling machine, drilling and milling chuck, its function is to clamp drill cutter or knife. Er flexible collet is currently the most used. Its stable performance, high accuracy by the majority of manufacturers trust. All products are precision grinding, in line with the German DIN 6499 specifications precision manufacturing.specification1. Material: 65Mn alloy spring steel2. Hardness: HRC45-483. Standard: DIN 6499B4. Concentricity: runout less than 0.008 mm5. Monthly capacity: 30,