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Specification: Clamping range: 3-16mm / 0.12-0.63in,denotes that clamp the drill between 3mm and 16mm. Working Principle:The key type drill chuck by using anti-thrust bearing to convert key-applied torsion into superior gripping. Specification: Clamping range: 3-16mm / 0.12-0.63in,denotes that clamp the drill between 3mm and 16mm. Package List:1 ???¨¬?¡§| Drill Chuck;1 ???¨¬?¡§| Key;1 ???¨¬?¡§| SDS Electric Hammer Round Shank Adapter. 1/2-20UNF: 1/2-20UNF represents a screw hole of with 1/2-20UNF at the back of the drill chuck.