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1/2-20UNF: 1/2-20UNF represents a screw hole with 1/2-20UNF at the back of the chuck. Electrophoretic Paint Treatment:The shell is treated with electrophoretic paint,making the product anti-rust even in worst environment. Package List:1 ??¡ì?¨¦ Drill Chuck; 1 ??¡ì?¨¦ Key; 1 ??¡ì?¨¦ 1/4 Hex Head Adapter. 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.