【Material】Alloy material,high hardness and durable. 【Chuck Diameter】3/4" (20mm) ,3/8" (10mm) ,1/2" (13mm) , 5/8" (16mm) 【Outer Diameter of Gear】001:25mm/002:12.5mm/003:17.5mm/004:21.5mm 【Usage】 Used for controlling tightness of looseness of electric drill clamping tool.Can be used in hammer or drilling mode. 【 Package Included】4x Drill Chuck Key.
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