McMaster 2815A13 Jacobs Taper Mount Keyed Drill Chuck, Number 3, for 0.04" to 1 2" Bit Shank Size, Model 14N 20G231 Amps @ 250VAC 10 A Amps @ 250VAC 10 A Knob Plastic HP @ 240V 2 hp Max Water Gauge Wetted Parts Brass Bronze Removable Bezel No Dial Face Material Aluminum Hazardous Location Rating Not Rated Primary Pressure Range 0 to 300 Process Temperature Range 40 Degrees to 150 Degrees F Movement Type PowerFlex Gauge Accuracy Grade Grade B Commercial Lens Material Polycarbonate Pointer Color Black Sensor Material Phosphor Bronze Sensor Type Bourdon Tube Process Connection Gender Male IP NEMA Rating Not Rated Scale Type Single Process Connection Type NPT Dial Color White Bezel Mounting Type No Bezel Heavy Duty — Heavy duty chucks give you the rigidity and heft needed for high torque drilling in hardened metal choose a chuck where your drill bit diameter falls in the middle of the bit shank size range