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Coolant Through: No | Finish: Black Oxide | Material: Hardened Alloy Steel | Rear Thread: 1-8 | Brand: DZ. It is critical that the Retention Knob ordered is the correct one for the machine in which it will be used. Using the wrong Retention Knob can cause damage to the machine spindle and tool holder. It may also cause a safety hazard. Buyer is responsible for the verification of the supplied knob(s) for his/her machine. Please consult the machine manual or measure an existing knob to ensure proper replacements are ordered.