http://www.tzhrmachine.com/bench-vises/
Description
There are two kinds of wrench chucks: wrench-type and hand-tight type. Wrench-type need a wrench to finish tightened and it is common in the machine tool industry. The category of hand-tight tightens the chuck by holding the specific sleeves, which is common in electric hand drills. Because wrench can lengthen the moment arm and increase the torque input in the process of tightening, the clamping has strong force.
