Jacobs JCM6309 Drill Chuck JT3, 3/16 in to 51/64 in Capacity, K4 Key

Drill Chuck, Jacobs Taper, Mounting Size JT3, Max. Drill Capacity 0.8000 in Chuck Type Keyed Material Steel Bearing Type Plain Capacity Max. 0.800" Capacity Min. 0.188" Includes Chuck Key Construction Steel Key Number K4 For Use With Bench and Floor-Mounted Power Tools Type Heavy Duty Nominal Capacity 3/4 in Mounting Type Jacobs Taper Material - Machining High Speed Steel Min. Drill Capacity 0.1800 in Features Hardened Keyholes, Hardened Nose, Jaws Center-Grind for Straightness and Alignment, Through-Hardened Sleeve Teeth Max. Drill Capacity 0.8000 in Keying Keyed Product Type Drill Chuck T.I.R. Tolerance 0.004 in Includes Key Chuck Key Included Includes Sleeve Sleeve Included Jacobs Taper Drive Type Standard Drive Series 36 Compatible Tool Type Bench Top-Mounted Power Tools, Floor-Mounted Power Tools Duty Rating Heavy