The drill chuck key with high quality, heavy-duty ball bearing design for long tool life. Smooth jaw movement with advanced gripping torque. Versatile design for drilling application on portable.Model: CF-DC002Chuck type: keyedCapacity Max.: 0.500"Capacity Min.: 0.800''Mounting Size: 5/8-16Nominal Capacity: 1/2''Bearing Type:  plain bearingIt suitable for impact drill, is good quality with big impact capacity.Using key to take down the chuck, it not easy drop out