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Those chucks require the key to provide the necessary torque to tighten and loosen the jaws;Our chuck key which is ideal to tighten and loosen a chuck.
- Item Name: Chuck Key
- Pilot Size: 5/16" in Diameter; Mesurement: 3.25 x 2.8" (L*W)
- Material: Metal
- Weight: 62g
- Package Content: 1 x Chuck Key