An OHIO GWZ weld screw has three projections on top of the head for welding to the
sheet surface, not through it. From a design standpoint, the GWZ screw will eliminate
the necessity for holes, thus is ideal for those applications where product appearance
or potential leakage is a prime consideration. There are no screw heads to protrude
or spoil appearance or the product. With GWZ screws, the exterior surface is left
virtually unmarred. The GWZ weld screw is an excellent choice for blind locations
too, because it can be permanently pre-attached.