Superchuck Ball Bearing Chuck, K4 Key, 1 8 in to 3 4 in Capacity, 4JT Short Mount ORS NASCO Absorbs more water and oil Absorbs more water and oil than rags for faster cleanup Tough enough for big jobs Easy access to the valve handle with no need to remove the protective cap and replace regulators each time access to cylinder is needed Comes with a lock for extra security Comes in safety yellow for added visibility Ball bearing construction maximizes gripping force and drilling accuracy Jaws center ground for straightness and alignment One piece sleeve eliminates crack between driving teeth often found in other designs Through hardened sleeve teeth plus hardened nose and keyholes provide outstanding wear resistance Fluted sleeve standard