This drill chuck is designed for heavy- and medium-duty applications using portable, bench, or floor-mounted power tools. The chuck jaws are center ground for absolute straightness and alignment. The through-hardened sleeve teeth and hardened chuck nose provide superior wear resistance. This listing is for each. Technical Specification Item Drill Chuck Chuck Type Keyed Material Steel Bearing Type Plain Bearing Capacity Max. 0.5 Capacity Min. 0.04 Mounting Size 6JT Key Number K3 Mounting Type Jacobs Taper Nominal Capacity 1/2 Includes Chuck Key