These Z-Series Clamps are available in your choice of round or square shapes, and come in either economical zinc construction, or durable stainless steel construction. These Z-Series Glass Clamps come in sizes to accommodate glass thicknesses from 1/4 to 5/16 inch (6 to 8 millimeter). The radius base design can be applied 2 inch (50.8 millimeter) tubing. By drilling a hole in the glass, the pin included with each clamp can be used to eliminate glass slippage. Popular applications are partitions, mezzanines, wind breaks, railings and other commercial uses.