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Check the listing for details. Clamping Nut Collet High Hardness High Strength Holder Lathe Turning Tools. Condition: New. Listed at 13.43 USD. ER Collet Mills A-Nuts for CNC Collets. 4 ER11 A-type clamping nuts. High strength and hardness. Made of - materials for durability. Material: Grade 1 40CR steel. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.