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Material: Aluminum alloy, Features Good. Corrosion Resistance And Heat Resistance, So It Is Sturdy And Durable. Screw shrink crimping, Which Can Firmly Lock The Drill Bit. Uses: It Is Fixed On The Drill Bit To Limit The Depth Of The Drill Hole That Ensures The Hole Depth Is Consistent. Packing List: 5 * Stop Collar (6,8,10,12,14mm), 2* Hex Wrench.