3.0 16MM 1/2 20UNF Drill Chuck,Key Type Chuck with Square Shank Adapter, Key

[MOUNT COMPATIBILITY] Built with a 1 by 2 20UNF rear thread this drill chuck is designed to match compatible drills securely and helps reduce buying mistakes caused by thread mismatch. [CLAMPING RANGE 3 TO 16MM] The 3 to 16mm 0.12 to 0.63in capacity fits a wide range of drill bits making it practical for light to heavy drilling tasks on compatible electric drills and shop setups. [KEYED GRIPPING POWER] This key type drill chuck uses anti thrust bearing action to convert key applied torsion into strong gripping force helping hold bits tightly during demanding drilling work. [WEAR RESISTANT JAWS] Specially treated clamping jaws offer high wear resistance while the high accuracy thread and tapered holes help the chuck attach tightly to tools for steadier operation. [COMPLETE ADAPTER KIT] Package includes 1 drill chuck 1 chuck key and 1 SDS electric hammer square shank adapter giving users repair workers and workshop users a convenient ready to use set.