Use an arbor press or other comparable pressure instrument to push these studs into a hole that has been punched or drilled. The stud is held firmly in place by ribs beneath the head, which is another name for self-clinching studs. The length indicated is the total length. 

For more strength and rigidity than ordinary studs, weld in place. These studs feature projections that focus the weld and a broad base that distributes the load. The length indicated is the total length. 

These studs should be welded to flat surfaces in tight spaces, narrow channels, and corners.